Tag Archives: Caltech

Astronomer Virginia Trimble: ‘There were 14 women on the Caltech campus when I arrived in 1964’ | Astronomy

Virginia Trimble, 78, is a professor of physics and astronomy at the University of California, Irvine, whose astronomy career spans more than 50 years. She has studied the structure and evolution of stars, galaxies and the universe and published more than 1,000 works, including research papers in astronomy, astrophysics, the history of science and scientometrics – the field concerned with measuring scientific outputs – as well book reviews and biographies. She has co-edited The Sky Is for Everyone, a new collection of 37 autobiographical essays by distinguished female astronomers, including herself. Spanning a range of generations and nationalities, each tells of the barriers they have overcome to change the face of modern astronomy.

What got you into astronomy?
It wasn’t a love of stars: I grew up in Los Angeles very nearsighted and never saw the night sky. I really wanted to be an Egyptologist, but the University of California, Los Angeles [UCLA] didn’t have an archaeology major. My father looked at the catalogue and saw astronomy. I enrolled in an astronomy-math double degree but that got moved to the school of engineering, which wasn’t terribly welcoming to women, so I switched to astronomy-physics. I started at UCLA in 1961 in the gifted students’ programme.

In 1962, you were featured in a Life magazine article, Behind a Lovely Face, a 180 IQ. Where did that lead?
As a result, I was approached by a publicity agency looking for some way to bring up the ratings of what was going to be the last year of the Twilight Zone programmes. In my year being Miss Twilight Zone, I toured 10 cities where television ratings were taken, doing newspaper, radio and television interviews. The shtick was that I was reading the scripts for accuracy. Some of my suggestions were taken, for instance that there is a difference between a solar system and a galaxy. It brought in some extra, much-needed pennies.

You started graduate school at the prestigious California Institute of Technology, or Caltech, in 1964 when you were not quite 21. You were awarded your joint master’s in physics and astronomy in 1965 and your PhD in astronomy in 1968. Was it hard getting in?
I hadn’t quite realised that they admitted women only under exceptional circumstances. My exceptional circumstance was that my fellowship required me to go someplace other than my undergraduate institution and I didn’t want to leave home (Caltech and UCLA were the only two places in southern California with astronomy majors). There were 14 women on the entire campus when I arrived, and the two women who arrived ahead of me in astronomy both came with their husbands.

It seems Caltech was a hotbed of seduction. You became friendly with the physicist Richard Feynman by modelling for him…
I had quickly noticed in both my undergraduate and graduate classes there were a lot of nice men – students and faculty. The astronomy professor who became my PhD adviser – Guido Münch – and I were lovers for about three years until I left Caltech.

Feynman was learning to draw and he’d seen me walking across campus and decided: “I want that one.” He saw Münch coming out of the building I had gone into and went up to him and said: “I’m hunting, perhaps you know the quarry.” Münch brought Feynman to my office and introduced us.

Feynman paid me $5.50 an hour (a lot then) plus all the physics I could swallow. His studio was in the basement of his house in Altadena and I used to go there Tuesday evenings for a couple of hours. Sometimes I posed nude. Sometimes we cuddled, but innocently. I recall once he suggested we cuddle on the couch, and I said I didn’t think we really wanted to do that. His wife quite often brought us orange juice and cookies, and I didn’t want to be naked on the couch with Feynman when she did.

Wasn’t it creepy to be involved with these professors? There was a big power imbalance.
I enjoyed the company of men who liked me. I was never aware of a power imbalance; I could always just walk away. Of course, it would get us all fired today!

You have published hundreds of research papers, but perhaps your colleagues know you best for your amusing, must-read annual summaries of astrophysics research, which you undertook for 16 years starting in 1991. How deliberate was the humour?
I couldn’t help [the jokes]. I am told that if we who are on the autism spectrum – and I would say I am slightly Aspergerish – simply describe things the way we see them, it strikes many other people as amusing. But some of the footnotes were designed to be funny. I described distinguished colleagues by pseudonyms such as “the rotund musician” or “the keen amateur dentist”. I made enemies both by not citing people and by citing them, because quite often I picked out something from their paper which was not what they had primarily intended. It was said that each time [a summary] came out you could see the Princeton astronomers tiptoeing into the library late at night to see if they had been mentioned.

How have things changed for female astronomers?
The first women in astronomy came in through a father, brother or husband, and some almost certainly married in order to do science. Then came being a human computer [which involved doing calculations by hand, and later machine]. These women didn’t necessarily fall in love with astronomy but it was an interesting job that a college-educated woman could do that wasn’t teaching or nursing. Then in the US, driven by post-Sputnik concerns, graduate programmes in space-related fields grew rapidly. They were so desperate to expand they even hired women faculty! Today roughly 30-40% of astronomy graduate students are female, though that lessens up the hierarchy.

Which female astronomers have been overlooked for a Nobel prize?
Cecilia Payne-Gaposchkin discovered that stars are made of hydrogen and helium. But she wasn’t believed until it was confirmed by men. Jocelyn Bell (later Bell Burnell) was a PhD student when she participated in the discovery of pulsars but the resultant share of the Nobel prize was awarded only to her male supervisor. In contrast, the male PhD student who recognised the signal from the first binary pulsar shared the prize with his adviser.

Various female astronomers in the book note some shockingly sexist behaviour and at least one details being sexually harassed in an elevator. You must have experienced some of this in your working life, but you don’t seem too riled about men behaving badly…
Clearly “men behaving badly” has been a major problem for some of my colleagues, and I don’t want to seem to be defending law-breakers. I don’t feel that I have ever been sexually harassed. I am friends with some senior male scientists who’ve been accused of being seriously inappropriate and I just find it hard to believe. I think perhaps some things can feel very different to different women.

What words of advice would you give young women who want an astronomy career?
Nearly everybody says: follow your passion. My view is: find something you’re good enough at to earn your living and do it.

  • The Sky Is for Everyone, edited by Virginia Trimble and David A Weintraub, is published by Princeton University Press (£25). To support the Guardian and Observer order your copy at guardianbookshop.com. Delivery charges may apply

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Caltech Names Laurie Leshin Director of JPL

At WPI, Leshin focused on expanding research, WPI’s signature Global Projects Program, and ways to address gender disparity in STEM. In addition, during her presidential tenure, new academic and collaboration spaces were developed on the WPI campus, notably a 40,000-square-foot Innovation Studio, with flexible, creative space for active learning classrooms, and the newly opened Unity Hall, a 100,000-square-foot academic building focused on robotics engineering, data science, cybersecurity, learning sciences and technology, and other emerging interdisciplinary programs. WPI is now among STEM institutions with the highest percentage of female undergraduate students and is recognized for its balance of excellence in teaching and groundbreaking research.

Alongside her administrative career, Leshin has continued her scientific endeavors, which are focused on deciphering the record of water on objects in our solar system. For example, she served as a member of the Mars Science Laboratory science team that analyzed data collected by the Curiosity rover to find evidence of water on the surface of Mars. She has also been involved in planning and advocating for Mars Sample Return missions for more than two decades.

Raised in Arizona, Leshin earned a bachelor’s degree in chemistry from Arizona State University (ASU), followed by master’s and doctoral degrees in geochemistry from Caltech. After a postdoctoral fellowship at UCLA, she served as a professor of geological sciences at ASU and director of its Center for Meteorite Studies. Before leaving ASU for NASA, she led the formation of ASU’s pathbreaking School of Earth and Space Exploration.

Leshin is a recipient of NASA’s Outstanding Leadership Medal and Distinguished Public Service Medal, and of the Meteoritical Society’s Nier Prize, awarded for outstanding research in meteoritics or planetary science by a scientist under the age of 35. The International Astronomical Union recognized her contributions to planetary science with the naming of asteroid 4922 Leshin.

In 2004, Leshin served on President George W. Bush’s Commission on Implementation of United States Space Exploration Policy, a nine-member commission charged with advising the president on the execution of his new Vision for Space Exploration. In 2013, President Barack Obama appointed Leshin to the advisory board of the Smithsonian Institution’s National Air and Space Museum. Since 2016, she has co-chaired the National Academies Government-University-Industry Research Roundtable.

In 2021, Leshin received Caltech’s Distinguished Alumni Award, which is bestowed annually by the Institute in recognition of personal and professional accomplishments that have made a noteworthy impact in a field, community, or society more broadly.

A committee composed of Caltech trustees, faculty, senior administrative leaders, and two members of the JPL community conducted an extensive search and recommended Leshin to Caltech’s president. JPL, which was founded by Caltech faculty and students in 1936, has been managed by Caltech on behalf of NASA since 1958.

Interim director Lt. Gen. James will resume his position as deputy director when Leshin formally assumes her position.

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Elon Musk’s Starlink Is Causing More Streaks to Appear in Space Images

A Starlink satellite streak appears in a ZTF image of the Andromeda galaxy, as pictured on May 19, 2021.
Image: ZTF/Caltech

Researchers at the Zwicky Transient Facility in California have analyzed the degree to which SpaceX’s Starlink satellite constellation is affecting ground-based astronomical observations. The results are mixed.

The new paper, published in The Astrophysical Journal Letters and led by former Caltech postdoctoral scholar Przemek Mróz, offers some good news and some bad news. The good news is that Starlink is not currently causing problems for scientists at the Zwicky Transient Facility (ZTF), which operates out of Caltech’s Palomar Observatory near San Diego. ZTF, using both optical and infrared wavelengths, scans the entire night sky once every two days in an effort to detect sudden changes in space, such as previously unseen asteroids and comets, stars that suddenly go dim, or colliding neutron stars.

But that doesn’t mean Starlink satellites, which provide broadband internet from low Earth orbit, aren’t having an impact. The newly completed study, which reviewed archival data from November 2019 to September 2021, found 5,301 satellite streaks directly attributable to Starlink. Not surprisingly, “the number of affected images is increasing with time as SpaceX deploys more satellites,” but, so far, science operations at ZTF “have not yet been severely affected by satellite streaks, despite the increase in their number observed during the analyzed period,” the astronomers write in their study.

The bad news has to do with the future situation and how satellite megaconstellations, whether Starlink or some other fleet, will affect astronomical observations in the years to come, particularly observations made during the twilight hours. Indeed, images most affected by Starlink were those taken at dawn or dusk. In 2019, this meant satellite streaks in less than 0.5% of all twilight images, but by August 2019 this had escalated to 18%. Starlink satellites orbit at a low altitude of around 324 miles (550 km), causing them to reflect more sunlight during sunset and sunrise, which creates a problem for observatories at twilight.

Astronomers perform observations at dawn and dusk when searching for near-Earth asteroids that might appear next to the Sun from our perspective. Two years ago, ZTF astronomers used this technique to detect 2020 AV2—the first asteroid entirely within the orbit of Venus. A concern expressed in the new paper is that, when Starlink gets to 10,000 satellites—which SpaceX expects to achieve by 2027—all ZTF images taken during twilight will contain at least one satellite streak. Following yesterday’s launch of a Falcon 9 rocket, the Starlink megaconstellation consists of over 2,000 satellites.

In a Caltech press release, Mróz, now at the University of Warsaw in Poland, said he doesn’t “expect Starlink satellites to affect non-twilight images, but if the satellite constellation of other companies goes into higher orbits, this could cause problems for non-twilight observations.” A pending satellite constellation managed by OneWeb, a UK-based telecommunications firm, will orbit at an operational altitude of 745 miles (1,200 km), for example.

Launch of a SpaceX Falcon 9 rocket with 49 Starlink satellites on board, as imaged on January 18, 2022.
Photo: SpaceX

The researchers also estimated the fraction of pixels that are lost as a result of a single satellite streak, finding it to be “not large. By “not large” they mean 0.1% of all pixels in a single ZTF image.

That said, “simply counting pixels affected by satellite streaks does not capture the entirety of the problem, for example resources that are required to identify satellite streaks and mask them out or the chance of missing a first detection of an object,” the scientists write. Indeed, as Thomas Prince, an astronomer at Caltech and a co-author of the study pointed out in the press release, a “small chance” exists that “we would miss an asteroid or another event hidden behind a satellite streak, but compared to the impact of weather, such as a cloudy sky, these are rather small effects for ZTF.”

SpaceX has not responded to our request for comment.

The scientists also looked into the measures taken by SpaceX to reduce the brightness of Starlink satellites. Implemented in 2020, these measures include visors that prevent sunlight from illuminating too much of the satellite’s surface. These measures have served to reduce the brightness of Starlink satellites by a factor of 4.6, which means they’re now at a 6.8 magnitude (for reference, the brightest stars shine at a magnitude 1, and human eyes can’t see objects much dimmer than 6.0). This marks a major improvement, but it’s still not great, as members of the 2020 Satellite Constellations 1 workshop asked that satellites in LEO have magnitudes above 7.

The current study only considered the impacts of Starlink on the Zwicky Transient Facility. Every observatory will be affected differently by Starlink and other satellites, including the upcoming Vera C. Rubin Observatory, which is expected to be badly affected by megaconstellations. Observatories are also expected to experience problems as a result of radio interference, the appearance of ghost-like artifacts, among other potential issues.

More: Elon Musk Tweets Video of ‘Mechazilla’ Tower That Will Somehow Catch a Rocket.

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Caltech Astronomers Claim They Know Where to Look in the Sky to Find ‘Planet Nine’

Two astronomers at the California Institute of Technology in the United States, have plotted the probability distribution function of the orbit of Planet Nine – a hypothetical planet that lies beyond Neptune in our solar system and could have a mass six times of Earth. Caltech astronomers Mike Brown and Konstantin Batygin have been working for five years to find the Planet Nine, which is hard for astronomers to find if it exists, because of its distance from the sun – 300 times the distance from the Sun to Earth.

According to the scientists, after the five years of their proposition, they now know where to look in the sky to find Planet Nine.

Astronomers say that despite them having a general idea about the mysterious planet, “we couldn’t really give a full assessment of the range of uncertainties for where in the sky Planet Nine might be, how massive it might be, and how bright it might be. Now we can,” writes Brown in a statement posted on a blog dedicated to the astronomers’ search for the mysterious world.

In the outer solar system, beyond Neptune’s orbit, lies a circumstellar disc — of which Pluto is a part — that is believed to consist of over 100,000 solar system bodies more than 100 kilometres in size. This disc is similar to the main asteroid belt and is known as the Kuiper belt.

According to scientists, the most distant objects in the Kuiper Belt has anomalous orbits in a way that all their orbits somewhat point in the same direction, indicating a gravitational signature that is influencing their orbits. While the two astronomers proposed that Planet Nine is behind the influence on this anomalous behaviour, some other scientists question their proposition by saying that this anomalous behaviour could be an observational bias.

The new paper, submitted on August 22 for publication in Earth and Planetary Astrophysics, maps the probable orbits along with making predictions about its properties.

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