Tag Archives: system

Swirling Vortex of Bathtub Water Reveals an Elusive Mechanism of Black Hole Physics

When a black hole is active, we tend to focus on the effect it has on the material it’s slurping up. It makes sense to do so; black holes themselves are difficult to probe. But the interaction between the black hole and the material should have an effect on the black hole, too – as it gains material, it should also gain in mass.

 

Such small feedback responses – especially ones previously ignored as trivial – are known as backreactions, and scientists have just observed an analogue of one that’s specific to black holes, and which can be seen in water swirling down a drain.

It’s a detection that could help study black hole phenomena that are too subtle for our current instruments, such as the Hawking radiation that is thought to be emitted by black holes. This is a theoretical type of black-body radiation that would eventually – after a very, very long time – see a black hole completely evaporate, provided it was not growing at all.

In order to study cosmic objects in finer detail than we can across the vast distances of space, scaled-down versions, or analogues, can be created in a lab. Like, for instance, a recent experiment to replicate white dwarf core pressures.

Black hole analogues are an excellent way to find out more about these enigmatic objects, and different kinds can help reveal their secrets in multiple ways.

Optical fibre and Bose-Einstein condensates have both been used to learn more about Hawking radiation. But one of the simplest has to do with how black holes feed: the draining bathtub vortex.

 

Black hole accretion can be compared with water swirling down a drain. Treating matter as a ripple in a field, the water can stand in for spacetime itself, or a field rippling with quantum activity.

Measuring the ripples responses as the water vanishes down a swirling drain might have something to say about waves of energy disappearing into a black hole.

A bathtub vortex black hole analogue. (The University of Nottingham)

From such analogues, we’ve learnt a lot about the effect of black holes on the space and material around them. But with an external water pump keeping the background of the system steady, it was unclear whether a water black hole analogue would have the freedom to be able to react to waves.

This set of experiments is the first time a draining bathtub vortex has demonstrated an effect on the black hole itself.

“We have demonstrated that analogue black holes, like their gravitational counterparts, are intrinsically backreacting systems,” said physicist Sam Patrick of the University of Nottingham in the UK.

“We showed that waves moving in a draining bathtub push water down the plug hole, modifying significantly the drain speed and consequently changing the effective gravitational pull of the analogue black hole.”

 

When waves were sent rippling into the system towards the drain, they pushed extra water in, accelerating the “accretion” process so significantly that the water levels in the tub dropped noticeably, even while a pump maintained the same level of water going in.

This change in the water level corresponds to a change in the properties of the black hole, the researchers said.

This could be extremely useful information, partially because an increase in mass changes the gravitational strength of a black hole – it changes the way the black hole warps its surrounding spacetime, as well as the effect the black hole has on the accretion disc. In addition, it offers a new way to study how waves can affect black hole dynamics.

“What was really striking for us is that the backreaction is large enough that it causes the water height across the entire system to drop so much that you can see it by eye! This was really unexpected,” Patrick said.

“Our study paves the way to experimentally probing interactions between waves and the spacetimes they move through. For example, this type of interaction will be crucial for investigating black hole evaporation in the laboratory.”

The team’s research has been published in Physical Review Letters.

 

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This Insane Picture of The Moon Was Actually Taken From Earth

A test of a powerful new space imaging instrument has given us a gloriously detailed new perspective of the Apollo 15 Moon landing site.

By bouncing a powerful radar signal off the lunar surface, the new instrument has been able to achieve spectacular resolution, showing objects as small as 5 metres (16.4 feet).

 

Designed for the Green Bank Telescope in West Virginia by Raytheon Intelligence & Space, this proof-of-concept technology paves the way for even more powerful radar imaging in the future, potentially allowing scientists to study objects even as far away as Neptune.

Radar imaging of the Moon is not a new idea, however. It’s an extraordinarily useful tool for revealing fine structures on the surface and, at longer wavelengths, even probing over 10 metres below the surface to observe variations in the density of the regolith (here on Earth, this technology can help us find buried ruins).

But the Green Bank Observatory, the National Radio Astronomy Observatory, and Raytheon Intelligence & Space are trying to push the technology even further.

(Sophia Dagnello, NRAO/GBO/Raytheon/AUI/NSF/USGS)

In a test in November of last year, the new transmitter sent out a radar signal to the Moon, specifically targeting the Apollo 15 landing site – a small patch of Moon, on a disc 3,474.2 kilometres (2,158.8 miles) in diameter, hundreds of thousands of kilometres away.

This signal, when it bounced back, was collected by the Very Long Baseline Array. This is a collection of radio telescopes across the US, basically combining to create a continent-sized collecting dish.

The image below is the result. That divot in the top middle is a crater called Hadley C, about 6 kilometres across. Snaking past it is the Hadley Rille, thought to be a collapsed lava tube.

(NRAO/GBO/Raytheon/NSF/AUI)

Believe it or not, though, this ain’t even the half of it. Now that they have successfully proven the concept, the team will be working on an even more powerful transmitter: a 500-kilowatt, high-power radar system that will enable them to see in even more incredible detail.

This tool would be useful for all sorts of science. We could see our Moon more closely, sure. We could see other planets’ moons. It could even be used to image passing asteroids and space debris, which are too faint to see using optical telescopes, but that we can probe using radar technology.

 

This could help us better understand the population of objects – both natural and anthropogenic – in near-Earth space, which in turn could aid in planetary defence against potentially hazardous objects.

“The planned system will be a leap forward in radar science, allowing access to never before seen features of the Solar System from right here on Earth,” said site director Karen O’Neil of the Green Bank Observatory.

And if it gets us even more incredible pictures of the Moon, we’re so here for it.

 

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Family Photo Snapped by Solar Orbiter Shows Venus, Earth And Mars Gleaming Like Stars

Every now and again, we get a little glimpse of just how far human ingenuity has gone.

Quite literally: The above image was taken by a spacecraft travelling through the Solar System while it was at a distance of 251 million kilometres (156 million miles) from Earth – more than the distance between Earth and the Sun by nearly half again.

 

It was snapped by NASA and the European Space Agency’s Solar Orbiter, a mission to study the Sun, on 18 November 2020, while en route to its destination. It joins a burgeoning tradition of photos of Earth taken by instruments far beyond where humans ourselves can venture.

But it’s not just Earth in Solar Orbiter’s image; Venus and Mars make an appearance, too, 48 million and 332 million kilometres from the spacecraft, respectively. It’s a lovely family portrait when you think about it – three rocky planets, so similar in many ways, but so very different from each other – seen through a scientific instrument – the Heliospheric Imager – designed to study the heart of the Solar System.

(ESA/NASA/NRL/Solar Orbiter/SolOHI)

The Solar Orbiter launched in February 2020, and its flight was planned to make several Venus flybys to take advantage of the planet’s gravity for a speed boost, a manoeuvre known as a gravity assist. The image of the planets was taken as the Solar Orbiter was moving towards Venus for one of these flybys.

By the time Solar Orbiter arrives in position around the Sun to start operations in November 2021, it will be swooping far outside the planetary plane to glimpse the Sun’s polar regions. This will be tremendously exciting since, due to our vantage point on Earth, we’ve never directly imaged the Sun’s poles.

 

While it is in transit, the Solar Orbiter is making observations. This helps the Solar Orbiter team back here on Earth calibrate and test the instruments on board, but that data can be used for scientific analysis, too, of planets, of the solar wind, of space weather.

It gives us a little inspiring reminder, too, of the fragility and resilience of our own existence. Such photos always call to mind the words of Carl Sagan, in his 1994 book Pale Blue Dot, of a photo of Earth taken by Voyager 1 on its way out of the Solar System.

“Look again at that dot. That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives,” he wrote.

“The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilisation, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every ‘superstar,’ every ‘supreme leader,’ every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.”

 

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Bad Astronomy | A sextuple star system where all six stars undergo eclipses

This deserves a “whoa”: Astronomers have found a sextuple (six-) star system where, if you watch it for a few days, every star in it will at some point undergo an eclipse.

Whoa.

Multiple stars are just intrinsically cool: Unlike our Sun, sailing alone through space, multiples are where two or more stars orbit each other in a stable, gravitationally bound system. Half the stars in the galaxy are in multiple systems like that. Most are binaries (two stars orbiting each other) and some in trinaries (three stars). Fewer yet are in higher-order systems.

That’s the first thing that makes TYC 7037-89-1 special: It’s a sextuplet, a six-star system. It’s a little over 1,900 light years away, so a fair distance, but it’s bright enough to be detected by TESS, the Transiting Exoplanet Survey Satellite. TESS scans the sky measuring the brightnesses of stars to look for transiting exoplanets, which make mini-eclipses on their host stars, revealing their presence.

But it can find lots of other interesting things, too. TYC 7037-89-1 looks like one star in TESS data, but one that changes its brightness — a variable star. The astronomers who found it look in TESS data for stars that change brightness in a certain way, indicating that they’re multiple star systems.

What they looked for are eclipsing binaries: Stars that not only orbit each other, but also ones where we see their orbits nearly edge-on, so that the stars appear to pass in front of on another. When that happens the total light from the pair drops a little bit in a characteristic way. The astronomers set up automated software to look for such stars, and out of nearly half a million they found 100 that appeared to be three-star systems or more.

And that’s what brings up the second cool thing about TYC 7037-89-1: It’s not just six stars all orbiting every which way, but they’re arranged in binaries: One pair of stars orbits another pair of stars, and a third pair orbits them both!

The binary pairs are named A, B, and C in order of brightness, and each star in them is given the number 1 or 2 (again in order of brightness). The two inner binaries are then A (made up of stars A1 and A2) and C (C1 and C2), orbited farther out by the binary B (B1 and B2). A and C are separated by about 600 million kilometers (very roughly the distance of Jupiter from the Sun), taking about 4 years to go around each other — this was determined using archival data from other telescopes, including WASP and ASAS-SN. B orbits them both at a distance of about 38 billion km, taking 2,000 years to complete one period.

And that now brings up the coolest thing about this system: All three pairs of stars are eclipsing binaries! We see all three binary orbits nearly edge-on. A1 and A2 undergo mutual eclipses (A1 eclipses A2, then half an orbit later A2 eclipses A1) every 1.57 days, so they’re very close together. C1 and C2 orbit each other every 1.31 days, and B1 and B2 take 8.2 days.

Because each star in any given pair eclipses the other, by measuring how long the eclipse takes as well as other parameters (including taking spectra) we can learn important things like how big the stars are, how hot they are, and more. And this yields another surprise: All three binaries are very similar. They’re triplets!

In each, the bigger star is about 1.5 times the diameter of the Sun, slightly hotter, and about 1.25 times the Sun’s mass. Also in each, the smaller stars are about the same as each other, too: about 0.6 times the Sun’s mass and 0.6 times its diameter. They vary a little, but the point is they’re pretty close, which is peculiar.

This sort of system is just ridiculously unlikely. Models of how stars form show that sextuples are far more often made up of two trinary systems orbiting each other, not three binaries. So that’s rare enough, but to have all three binaries be seen edge-on seems impossible.

… “seems.” In fact it’s likely they formed from a swirling disk of material, each star collapsing out of it. Because of that it’s actually likely that the three orbital planes of the binaries are the same. Therefore if we see one edge-on, we see all of them edge on, or nearly so. That makes it not as unlikely as you might think that all three are eclipsing.

I’ll also note the orbits of the binaries around each other are not edge-on. We see the orbit of A and C around each other from an angle of roughly 40°, even as we see the individual stars in the binaries edge-on. The inclination of the orbit of B around them both isn’t well constrained by the observations, though.

Hopefully longer-term study of this system will yield more information about how they formed. We don’t really know much about multiple systems like this one, so understanding under what conditions they form would be pretty interesting.

I know, this is headache-inducing. So many orbits, angles, stars… Sometimes nature is complex, and it’s hard to keep up. If it helps, I describe a similar fictional system that played a key role in the first season of Star Trek: Picard. And more systems a bit like TYC 7037-89-1 are known; for example CzeV1640 is a quadruple system with two pairs of eclipsing binaries. Nature is complex, but sometimes frugal, reusing the same idea over and again.

But oh my, would I like a ship like Enterprise right now! To be able to see such a thing up close for myself, watch as these six stars — six! — dance around each other…

Strange new worlds indeed.

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A string of planets in our solar system sparkles in photos from 3 different sun probes

NASA’s Parker Solar Probe spotted six different planets on June 7, 2020, with the sun out of frame to the left. (Image credit: NASA/Johns Hopkins APL/Naval Research Laboratory/Guillermo Stenborg and Brendan Gallagher)

Turns out sungazing is not the only thing NASA’s solar spacecraft do.

Three missions that focus on the activities of our nearest star — Parker Solar Probe, the Solar and Terrestrial Relations Observatory (STEREO) and Solar Orbiter (a partnership with the European Space Agency) — have captured some incredible images showing several worlds in our solar system.

These spacecraft are flying in different areas of our neighborhood on a quest to understand solar phenomena such as the extreme heat of the sun’s outer atmosphere, the distribution of dust in our solar system or the production of the solar wind — the constant stream of particles coming from our sun. But each spacecraft caught amazing views of planets that NASA’s Goddard Space Flight Center in Maryland shared in a recent press release

Solar Orbiter 

This joint mission with ESA will eventually leave the plane of the solar system to study the sun’s poles. The spacecraft first transmitted test images in July 2020, about five months after its launch

On Nov. 18 came a particularly stunning image, when Solar Orbiter captured three planets in the same view. From left to right, you can see Venus (which appears exceedingly bright as the sun bounces off the planet’s clouds), Uranus, Earth and Mars. The sun is just out of the image view on the right-hand side of the frame. 

Solar Orbiter was roughly 155.7 million miles (250.6 million kilometers) away from Earth when the data was transmitted, which is a little less than twice the distance from the sun to Earth, or two astronomical units (AU). A single AU is roughly 93 million miles (150 million km). 

Parker Solar Probe 

NASA’s Parker Solar Probe will fly closer to the sun than any other spacecraft to date as it tries to capture the “origin story” of the solar wind. In this incredible wide-field image of June 7, 2020 (days before a close approach to the sun), it imaged six of our solar system’s planets. 

From left to right, they are Mars, Saturn, Jupiter, Venus, Earth and Mercury. The spacecraft was roughly one AU from Earth at imaging time, at 98.3 million miles (158 million kilometers).

STEREO 

NASA’s STEREO spacecraft spotted six planets on June 7, 2020. (Image credit: NASA/STEREO/HI)

The single operational STEREO spacecraft — one of a pair that circled the sun behind and ahead of Earth in our planet’s approximate orbit starting in 2014 — also gazed at the planets on June 7, 2020. In this image you can see the same six planets as Parker on the same date, but from a different vantage point in the solar system. 

From left to right appear Mercury, Mars, Venus, Earth, Saturn and Jupiter. The dark columns in the image are due to the detector being saturated, which is a combination of the long exposure time with the relative brightness of the planets compared to the background stars, according to NASA. 

STEREO’s normal mission is to study the sun’s outer atmosphere, or corona, along with the solar wind, to improve solar weather predictions.

Follow Elizabeth Howell on Twitter @howellspace. Follow us on Twitter @Spacedotcom and on Facebook. 



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Exoplanetary System Found With 6 Worlds in Orbital Resonance

200 light-years away from Earth, there’s a K-type main-sequence star named TOI (TESS Object of Interest) 178. When Adrian Leleu, an astrophysicist at the Center for Space and Habitability of the University of Bern, observed it, it appeared to have two planets orbiting it at roughly the same distance. But that turned out to be incorrect. In fact, six exoplanets orbit the smallish star.

And five of those six are locked into an unexpected orbital configuration.

Five of the planets are engaged in a rare rhythmic, dance around the star. In astronomical terms, they’re in an unusual orbital resonance, which means their orbits around their star display repeated patterns. That property makes them an intriguing object of study and one that could tell us a lot about how planets form and evolve.

“Through further observations, we realized that there were not two planets orbiting the star at roughly the same distance from it, but rather multiple planets in a very special configuration.”

Adrian Leleu, Center for Space and Habitability, University of Bern.

Adrian Leleu leads a team of researchers who studied the unusual phenomenon. They presented their findings in a paper titled “Six transiting planets and a chain of Laplace resonances in TOI-178.” The paper is published in the journal Astronomy and Astrophysics.

In the team’s initial observations, it appeared there were only two planets, as five of them move in such a way as to deceive the eye. But further observations showed that something else was happening in the system. “Through further observations, we realized that there were not two planets orbiting the star at roughly the same distance from it, but rather multiple planets in a very special configuration,” said lead author Leleu.

In this artist’s animation, the rhythmic movement of the planets around the central star is represented through a musical harmony, created by attributing a note (in the pentatonic scale) to each of the planets in the resonance chain. This note plays when a planet completes either one full orbit or one half orbit; when planets align at these points in their orbits, they ring in resonance. Credit: ESO

TOI-178’s orbital resonance is similar to another familiar orbital resonance right here in our own Solar System. That one encompasses Jupiter’s moons Io, Europa, and Ganymede.

The orbital resonance shared by Ganymede, Europa, and Io is fairly simple. Io makes four full orbits for every single orbit of Ganymede and two full orbits for Europa’s full orbit. But the planets around TOI-178 have a much more complex relationship.

TOI-178’s five outer planets are in a 18:9:6:4:3 chain of resonance. The first in the chain and second from the star completes 18 orbits, the second in the chain and third from the star completes 9 orbits, and it continues on from there. The closest planet to the star isn’t part of the chain.

For a system to be orbiting its star in such an orderly and predictable fashion, conditions had to be relatively sedate in this system. Giant impacts or planet migrations would have disrupted it. “The orbits in this system are very well ordered, which tells us that this system has evolved quite gently since its birth,” explained co-author Yann Alibert from the University of Bern.

But there’s more.

In our Solar System the small inner planets are all rocky, while the planets in the outer Solar System are large and gaseous. Beyond Neptune is a region of ice dwarf planets and Kuiper Belt Objects. Image credit: NASA/JPL/IAU

In our Solar System, the inner planets are rocky, and the planets beyond the asteroid belt are not; they’re gaseous. This is one of those instances where we might be tempted to think our Solar System represents some sort of norm. But the TOI-178 system is much different. Gaseous and rocky planets are not delineated like in our system.

“It appears there is a planet as dense as the Earth right next to a very fluffy planet with half the density of Neptune, followed by a planet with the density of Neptune. It is not what we are used to,” said Nathan Hara from the Université de Genève, Switzerland, one of the researchers involved in the study. 

“This contrast between the rhythmic harmony of the orbital motion and the disorderly densities certainly challenges our understanding of the formation and evolution of planetary systems,” says Leleu.

The team used some of the European Observatory’s most advanced, flagship instruments in this work. The ESPRESSO instrument on the VLT, and the NGTS and SPECULOOS instruments at the ESO’s Paranal Observatory. They also used the European Space Agency’s CHEOPS exoplanet satellite. These instruments all specialize in one way or another with the study of exoplanets, which are virtually impossible to detect with a “regular” telescope.

Exoplanets are a long way away from Earth, and the overpowering light from their stars makes them nearly invisible in a regular optical telescope.

The instruments used in this study detect and characterize exoplanets in a couple of different ways. But it all comes down to detecting light. The transiting method used by the NGTS (Next-Generation Transit Survey), CHEOPS (Characterizing ExOPlanet Satellite), and SPECULOOS (Search for habitable Planets EClipsing ULtra-cOOl Stars) detect the dip in starlight when an exoplanet passes in front of its star. The radial velocity method employed by ESPRESSO detects shifts in the starlight’s normal spectrum when an exoplanet tugs on the star and shifts its position ever so slightly.

By using multiple instruments with different methods and capabilities, the team was able to characterize the system in detail. The innermost planet in the system, which is not in resonance with the others, moves the fastest. It completes an orbit in just two Earth days. The slowest planet moves ten times slower than that. The planet sizes range from one to three Earth sizes, and the masses range from 1.5 to thirty times Earth’s mass.

The orbital resonance of the planets is in an exquisite balance. The authors write that “The orbital configuration of TOI-178 is too fragile to survive giant impacts, or even significant close encounters… a sudden change in period of one of the planets of less than a few .01 d can render the system chaotic.” They also write that their data “…shows that modifying a single period axis can break the resonant structure of the entire chain.”

This discovery just means more work for astronomers. The unusual orbital resonance and positions of the planets means they need to rethink some of our theories around the formation and evolution of planets and solar systems.

This figure from the study compares the density, mass, and equilibrium temperature of the TOI-178 planets with other exoplanet systems. In Kepler-60,
Kepler-80, and Kepler-223, the density of the planets decreases
when the equilibrium temperature decreases. Contrary to the three Kepler systems, in the TOI-178 system, the density of the planets is not a growing
function of the equilibrium temperature. The team behind this study says that if they can understand why the TOI-178 system is different, it could become a sort of Rosetta Stone for deciphering solar system and planetary development. Image Credit: Leleu et al, 2021.

As the authors write in their paper: “Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present.”

The nebular hypothesis, also called the Solar Nebular Disk Model (SNDM), is the working theory for the formation of our Solar System and others. According to the model, a giant molecular cloud undergoes gravitational collapse, and when enough gas gathers together, it eventually begins fusion, and a star’s life begins. Most of the material in the cloud will be taken up by the star, and in our Solar System, the Sun has the lion’s share: about 99.86%.

The remaining material makes up the protoplanetary disk, which rotates around the star in a flattened pancake shape. As material clumps together in the rotating protoplanetary disk, it eventually forms planets. There are some problems with the nebular hypothesis, and other theories have tried to explain them.

These are images of nearby protoplanetary disks. At the center of each one is a young star, and the gaps are in the disks are caused by forming exoplanets. Credit: ALMA (ESO/NAOJ/NRAO), S. Andrews et al.; NRAO/AUI/NSF, S. Dagnello

But this system challenges that theory. The SNDM suggests that rocky, terrestrial planets form nearer the star. They start out as planetary embryos and through violent mergers create planets like Venus, Mercury, Mars, and Earth. Gas giants, according to the SNDM, form out beyond the Solar System’s frost line, where planet embryos form out of frozen volatiles.

But the TOI-178 system challenges that understanding. If the planets in that system followed the SNDM, then the gas planets would be further from the star, and the rocky planets would be closer. Since they’re not, something must have disrupted them. But if something disrupted them, their orbits wouldn’t be choreographed in such an exquisite rhythm. It’s a conundrum.

“Understanding, in a single framework, the apparent disorder in terms of planetary density on one side and the high level of order seen in the orbital architecture on the other side will be a challenge for planetary system formation models,” they write.

Systems like this are challenging to understand, but ultimately, they drive researchers to think harder and to observe more fully.

As the team of scientists write in their conclusion: “The TOI-178 system, as revealed by the recent observations described in this paper, contains a number of very important features: Laplace resonances, variation in densities from planet to planet, and a stellar brightness that allows a number of followup observations (photometric, atmospheric, and spectroscopic). It is therefore likely to become one of the Rosetta Stones for understanding planet formation and evolution, even more so if additional planets continuing the chain of Laplace resonances is discovered orbiting inside the habitable zone.”

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Apple urges iPhone, iPad users to update operating system immediately after security flaws ‘may have been actively exploited’

Apple issued a new warning on Tuesday urging iPhone and iPad users to immediately update their device software to the newly released iOS and iPadOS 14.4.

APPLE WARNS MAGNETS IN IPHONE 12 MODELS ‘MIGHT INTERFERE’ WITH PACEMAKERS, DEFIBRILLATORS

The update comes in an effort to fix three security flaws that “may have been actively exploited”. Apple credited “an anonymous researcher” for finding the bugs, according to its support webpage.

One of the security vulnerabilities found is a malicious application which may be able to “elevate privileges” in Kernel, the framework for Apple’s operating system. Apple said the issue was addressed in the new update with “improved locking.”

The other two vulnerabiltiies were found in WebKit, a web browser engine used by Safari and other apps, which may allow a remote attacker to potentially cause “arbitrary code execution.” The logic issue has been addressed in the new update with “improved restrictions.”

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The security flaws impact the iPhone 6s and later, the iPad Air 2 and later, the iPad mini 4 and later, and the iPod touch (7th generation).

However, other details, such as who is actively exploiting the vulnerabilities, who might have fallen victim, or whether the attack was targeted against a specific set of users or widespread were unclear. Apple noted it would provide an update as soon as more details could be made available.

A spokesperson for Apple did not immediately return FOX Business’ request for comment.

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In order to install the latest update, simply open up the Settings app, choose General, and then choose Software Update.

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How Manaus, Brazil missed warning after warning until its health system collapsed

For the medical workers, it’s frantic 36-hour shifts. For the gravediggers, it’s moving the tons of dirt required to create 20,000 more graves.

For the dead, it’s the “vertical” burial, with bodies stacked atop each other in the increasingly crowded cemeteries of Manaus, Brazil.

This is the heartbreak of a city whose health care system has collapsed. And it isn’t the first time — in less than a year, this isolated city at the core of the Brazilian rainforest is witnessing its second coronavirus wave, a shock to the many who thought its first wave was so widespread that herd immunity must be the result.

Missed warnings

Manaus is the capital and largest city in the state of Amazonas. It has over 30 public and private hospitals, catering to numerous remote indigenous and small communities around the area. But the logistics of getting there — and supplying those hospitals — can be complicated. With road connections limited, most approaches to the city are by air or river.

The coronavirus first tore through Manaus like wildfire in April 2020, creating such a vast surge of cases that scientists speculated it might result in herd immunity. Politicians seized on the idea, hopeful they would be able to avoid economically damaging lockdowns in the future.

But in September 2020, the Oswaldo Cruz Foundation (Fiocruz), a highly regarded Brazilian research institute for public health, recommended that the city impose movement and business restrictions. Manaus was beginning to experience a second wave of the disease, it said. But the city did not impose one.

“We gave 13 alerts, and a very alarming one in mid-December, saying that the situation was getting very serious. Everyone was making fun of the studies and warnings, especially the President Jair Bolsonaro,” says Jesem Orellana, researcher at Fiocruz.

Orellana adds that both the state and federal government used the theory of herd immunity to back up their relaxed measures. “They all talked about herd immunity, and an environment was created for this discourse to crystallize, and the measures to relax. That feeling may have been responsible for this relaxation of people’s behavior.”

A few months later, by late December, the surging number of recorded Covid-19 deaths and cases in Manaus was undeniable. Amazonas state governor Wilson Lima acquiesced to expert advice, announcing new lockdown measures. But these were fiercely denounced by protesters who echoed Brazilian Bolsonaro’s urging to keep the country’s economy running. Lima quickly backed down and celebrations rang.
In an exclusive interview with CNN, Manaus mayor David Almeida now blames those protest gatherings and unfettered year-end celebrations for the current spike in cases, which has brought the city to a total of over 248,000 cases and more than 7,050 deaths.

“We are paying the price for this disobedience, these protests from the end of last year. A lot of people need to be held accountable for this,” said Almeida, who took office earlier this month. “During the New Year celebrations, it was precisely the party promoters who were the vectors for this transmission, this propagation and this rise in cases.”

Starting Monday, the state of Amazonas will now go into a seven-day lockdown.

Running out of oxygen

By early January, it became clear that the city was on the verge of running out of oxygen — critical for patients with severe cases of Covid-19.

A company named White Martins, which supplied hospitals in Manaus with oxygen, emailed officials from both Amazonas state and the federal Health Ministry by January 8, warning that shortages loomed, according to a report by Brazil’s Solicitor General.
Health Minister Eduardo Pazuello visited Manaus January 11, and the federal government sent supplemental oxygen on January 12 — but it was not enough.
According to the attorney general’s report, Pazuello also encouraged medical professionals to adopt a supposed “early treatment” kit against Covid-19 that combines drugs including hydroxychloroquine and ivermectin — neither of which have been proven as effective treatments for Covid-19. He has since denied doing this.

The day after his departure, a crisis exploded. Just as predicted, oxygen shortages pushed the city’s healthcare system into collapse last week, forcing authorities to airlift patients to other states. Local media described patients dying of asphyxiation. Preliminary numbers released by the Federal Prosecutor’s Office, which is investigating the crisis, attribute 29 deaths so far due to the oxygen shortages. That number is expected to increase as the investigation continues.

“The reality is that there’s a lower supply of oxygen,” Pazuello acknowledged later. “Not an interruption, but a lower supply of oxygen.”

The shortages persist today. Last week, CNN counted around 40 people in line to buy or replace oxygen cylinders from one private supplier, some frustrated, others anxious.

“There was no preparation from the state for this new surge,” Joseney Costa Vicente, 49, told CNN as he tried to buy oxygen for his mother, who is 69 and has tested positive for Covid-19. He spent 16 hours in a hospital with no oxygen or medical attention, he says, before the family decided to care for her at home.

“It makes me angry. We feel really upset and outraged with this whole situation.”

Eliane Rodrigues, 49, says at times she’s had to wait more than 12 hours to buy oxygen. Everyone in her house has tested positive for Covid-19, and her mother, 71, is in the worst shape.

Fatigued and stressed as they are, many believe it’s better to care for the sick at home than send them to a hospital.

“We don’t trust the government,” Rodrigues says, fearing having to take her mother to a hospital. “We’re afraid there will be more death than life there.”

Hospitals remain stretched to the limit. Over 530 people are still waiting for a hospital bed, according to the Amazonas State Health Secretary.

CNN visited three hospitals that said they could accept no more patients. People waited outside frantically hoping to find space to hospitalize their loved ones, some screaming and crying.

At one hospital’s doors, staff and a security guard worked to ensure that no one entered without authorization, but were unable to provide even basic information to panicked relatives waiting for updates on patients.

Waiting outside, Amanda da Silva Monteiro told CNN that no one had been able to locate her father, 71, for two days since his hospitalization with Covid-19.

“My dad is a working man. I have the right to know if he’s alive or dead,” da Silva Monteiro told CNN. “Every day we’re here but they don’t give us any information.”

Investigations and finger-pointing

Who is responsible for letting this lethal crisis boil over? Unpreparedness and political upheaval have been blamed for the current situation in Manaus. A clear disconnect between the local and federal governments has also created turmoil since the pandemic began last year.

The office of General Prosecutor Augusto Aras has called for an investigation into the Health Ministry’s response to warnings about Manaus’ oxygen shortages, as well as investigations into Amazonas state governor Lima, former Manaus mayor Arthur Virgilio Neto and current mayor Almeida.

But the federal government rejects responsibility for allowing oxygen shortages to reach such critical lows — and blames the government of Amazonas state instead. Brazil’s vice president Hamilton Mourão said earlier this month that — despite multiple warnings from scientists — there was no way to predict the collapse of Manaus’ health system. Pazuello himself denies that his ministry failed to act effectively, and Bolsonaro has accused the state government of mismanaging federal funds.

The Amazonas state government, in turn, has blamed the logistical challenges of rapidly resupplying this isolated city. On Sunday, the State Health Department told CNN that it was making “every effort, with the assistance of the Federal Government, to address the difficulties encountered in the oxygen supply logistics,” including deploying planes, helicopters and speedboats loaded with more oxygen cylinders.

For his part, Almeida says the city government is not responsible for the current crisis. Though all hospitals have been overrun with Covid-19 cases, he notes that city-run hospitals did not suffer as extreme oxygen shortages as state hospitals.

His month in office “feels more like a year,” he adds.

A recipe for catastrophe

Amazonas state authorities say they will soon open two more hospitals, one with federal support, to increase the city’s available bedcount. Pazuello, the Health Minister, has returned to Manaus and this time, he will stay “as long as necessary” to get the city’s health system back on track, he says.

But many Manaus residents have little confidence left in authorities to respond to the coronavirus — and emerging variants of the virus pose additional levels of complication and potential threat.

Luan Matos de Menezes, a 26-year-old ICU doctor, describes what he sees today as an even worse version of what the city suffered last year.

“What’s happening is really serious. You can tell that patients’ conditions are much more critical than in the first wave. It’s much more grave than in other parts of the country. The deaths are much quicker. The number of serious infections is much higher than in the first wave, and the patients are younger.” says Menezes.

“Yesterday I had a 24-year-old guy die in my ICU. I’ve got patients who are 32 and 29. Young patients who are in very critical condition.”

Tired and frustrated, Matos de Menezes says he blames both authorities and the Manaus community for failing to learn last year’s lessons, and for clinging to unproven theories instead of following scientific recommendation.

“So you have a community that thinks it’s safe based on a false (theory of) herd immunity and based on ineffective medicines for Covid-19, in addition to a new variant that is more transmissible and more serious that is circulating in the community… You had the recipe to make this catastrophe happen.”

And at every level, Brazilian officials failed to take preventative action in time, he concludes, attributing the slow response to a reluctance to damage the economy.

“A vaccine that starts off late, a lockdown that started late. Done in the name of a God that is called money, in the name of shop owners’ greed, in the name of businessmen’s greed. Until they realize that they are going to get sick and there won’t be a place to get treatment here and money won’t buy life.”

Correction: This story has been updated to clarify that Amazonas state will lock down for seven days on Monday, instead of ten.

Marcia Reverdosa reported from Manaus, Brazil. CNN’s Taylor Barnes and journalist Rodrigo Pedroso contributed to this report.

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Enigmatic Star System Has 5 Planets Locked in Perfect Harmony

Artist’s impression of the TOI-178 system.
Image: ESO

A unique planetary system located 200 light-years from Earth hosts five exoplanets with orbits locked together in a repeating pattern, despite their very different sizes and densities. The discovery is challenging astronomers’ notions of the kinds of planetary systems that can exist and how they form.

Five of six exoplanets in orbit around the star TOI-178 are in an 18:9:6:4:3 orbital resonance with each other, according to new research published today in Astronomy & Astrophysics. So for every 18 orbits made by the innermost of these five exoplanets, the next planet along the chain will complete nine orbits during the exact same period. The third will complete six orbits, and so on. The video below offers a demonstration of the process in action.

The innermost of the six exoplanets (shown with a blue orbital path) is not in resonance with the others, though it might have been in the past. In the animation above, rhythmic patterns are represented by red pulses and a chime sound (in the pentatonic scale), which get triggered when each exoplanet completes either a full orbit or a half orbit. As the video shows, two or more exoplanets trigger the chime quite often, the result of them being in orbital resonance. The new study was led by Adrien Leleu, CHEOPS fellow at the University of Geneva.

When Leleu, a dynamicist (an expert in celestial mechanics) and his colleagues first observed the TOI-178 system, they thought they saw two planets orbiting around the host star in the same orbit, but this result was inconclusive. The scientists decided to make follow-up observations using the European Space Agency’s CHEOPS satellite and the ground-based ESPRESSO instrument on the European Southern Observatory’s Very Large Telescope, in addition to the Next Generation Transit Survey and SPECULOOS projects, both in Chile. All these instruments allowed the team to detect the six exoplanets and characterize their orbits, which they did using the transit method (looking at the dimming of the host star when a planet passes in front) and by measuring the wobble of the host star.

All six exoplanets are in close proximity to the central star, with the nearest planet taking around two days to make a complete orbit and the most distant orbiting in around 20 days. None are inside the habitable zone, the Goldilocks region around a star where liquid water (and thus life) would be possible. Five of the six exoplanets are locked in perfect resonance, such that some planets come into alignment every few orbits. The 18:9:6:4:3 chain is among the longest ever discovered.

Orbital resonance happens when orbiting bodies exert a periodic gravitational influence on each other. In our solar system, Jupiter’s moons Io, Europa, and Ganymede are in a 4:2:1 resonance.

The TOI-178 is interesting for a number of reasons, with the orbital resonance a sign of prolonged stability.

“From our understanding of planet formations, chain of resonances often occurs in the earliest phases of planetary system formation, when the star is still surrounded by a gaseous disc,” Leleu explained in an email. “However during the billions of years that follow the formation, many things can happen and most systems get out of the resonances. It can happen slowly, due to [gravitational] tidal effects for example, or violently, due to instability and planet collision/ejection.”

Only five other star systems have resonant chains involving four or more planets, “which is not a lot,” he added. Astronomers consider these planetary systems to be rare and quite young.

“What is unique to TOI-178 is not only this orbital configuration, but also the planets’ composition,” said Leleu. This consequently presents a challenge to our understanding of how planets form and evolve.

Indeed, the planets are between one and three times the size of Earth but have masses ranging from 1.5 to 30 times the mass of Earth. So while their orbital configurations are neat and tidy, their compositions are not. For example, one planet is a super-Earth, but its immediate neighbor is a low-density ice giant similar to Neptune. We don’t see that sort of thing around here.

According to Leleu, theory suggests that the planets should have lower density the farther they are from their star. But that’s not the case here. “In TOI-178, it’s only true for the two inner planets that are rocky, but then the third planet from the star has a very low density, then planet 4 and 5 are more dense, and then planet 6 is once again more fluffy,” he said.

Astronomers will now have to figure out how the system formed, including whether some of the planets formed farther out and slowly drifted inward.

Interestingly, TOI-178 could host other, more distant planets, but they just haven’t been detected. Looking ahead, ESO’s upcoming Extremely Large Telescope, which should become operational later this decade, might be able to to learn more about this odd star system. 

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“Against All Odds” –NASA’s Planet-Hunting Tess Discovers a Unique Star System with Six ‘Suns’ (Weekend Feature)

 

“The system exists against the odds,” said Brian Powell, a data scientist at NASA’s High Energy Astrophysics Science Archive Research Center about the source of starlight that was mysteriously brightening and dimming some 1,900 light-years away. The source, named TIC 168789840, is a system of three pairs of binary stars: three different stellar couplets revolving around three different centers of mass, but with the trio remaining gravitationally bound to one another and circling the galactic center as a single star system.

“Just the fact that it exists blows my mind,” said first author, Powell. “I’d love to just be in a spaceship, park next to this thing and see it in person.”

Eclipses in the Lightcurves

The breadth of observation of TESS, encompasses nearly the entire sky, allowing for the identification of many candidate multiple star systems through the analysis of eclipses in the lightcurves. A collaboration between the NASA Goddard Space Flight Center and the MIT Kavli Institute, in conjunction with expert visual surveyors, has found well over 100 triple and quadruple star system candidates.

Most Systems are Quadruples

The large majority of the TESS discovered candidate triple and quadruple star systems are quadruples, followed by triples since it began searching the galaxy for exoplanets in 2018. But the source of starlight that was mysteriously brightening and dimming some 1,900 light-years away,” reports Robin George Andrews for the New York Times, “may top all those discoveries for its science fiction-like grandeur.”

“Though quadruple systems are much more rare than triple systems,” reports NASA, “the large outer orbit of the third star in a hierarchical triple, necessary for stability, substantially reduces the probability that the eclipse or occultation of the third star will be visually noticed in a TESS lightcurve. Beyond quadruple stars, the probability of systems with more stars being identified via photometry alone is remote, as the formation of sextuple systems is likely quite rare. This low probability is compounded by the requirement that each binary must be oriented in such a manner that they are all eclipsing.”

A Unique System

Although several of other six-star systems have been discovered, reports Andrews about NASA’s TESS discovery, this is the first in which the stars within each of those three pairings pass in front of and behind each other, eclipsing the other member of its stellar ballet, at least from the TESS space telescope’s view.

 

 

“These are the types of signals that algorithms really struggle with,” said lead author Veselin Kostov, a NASA Postdoctoral Fellow at Goddard Space Flight Center working. “The human eye is extremely good at finding patterns in data, especially non-periodic patterns like those we see in transits from these systems.”

Although exoplanets within the star system have yet to be confirmed, only one of the pairs could have any planets. Two of the system’s binaries orbit extremely close to one another, forming their own quadruple subsystem. Any planets there would likely be ejected or engulfed by one of the four stars. The third binary is farther out, orbiting the other two once every 2,000 years or so, making it a possible exoplanetary haven.

Its Origin a Mystery

“The origin of this whirling six-star system will remain a puzzle until we find others like it,” concludes Andrews. “Just the fact that it exists blows my mind,” said first author, Powell. “I’d love to just be in a spaceship, park next to this thing and see it in person.”

In 2019, TESS discovered its TOI 1338 its first circumbinary planet, a world orbiting two stars, 1,300 light-years away in the constellation Pictor. The two stars orbit each other every 15 days. One is about 10% more massive than our Sun, while the other is cooler, dimmer and only one-third the Sun’s mass. TOI 1338 b, the only known planet in the system. It’s around 6.9 times larger than Earth, or between the sizes of Neptune and Saturn. The planet orbits in almost exactly the same plane as the stars, so it experiences regular stellar eclipses.

The Daily Galaxy, Jake Burba, via Goddard Space Flight Center, NASA Arxiv.org PDF, and New York Times Science

Image Credit: NASA/MIT/TESS shows the spacecraft’s 13-sector mosaic of the southern sky, recorded over the course of a year. One object shown in the mosaic is a long, bright edge of our Milky Way galaxy.

 



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