Archive for Yale Center for Astronomy and Astrophysics

A new study shows established scientists are biased against women in science


A study shows that established scientists unconsciously rate budding female scientists lower than men with identical credentials.

Editor’s note: Meg Urry is the Israel Munson professor of physics and astronomy and chairwoman of the department of physics at Yale University, where she is the director of the Yale Center for Astronomy and Astrophysics.

(CNN) — In 2001, I became the first tenured female faculty member ever in Yale’s physics department. Throughout my 30 years as a physicist, being the only woman in the room has been the norm. Women fill more than half of the jobs in the U.S. economy but constitute fewer than 12% of working physicists and engineers. For me and for others in STEM fields (science, technology, engineering and mathematics), the dearth of women is not news.

What was big news last week was a study, from colleagues in other departments at Yale, explaining why this deficiency of women persists.

Evidence shows that established scientists at top research universities — those choosing and training the next generation of STEM experts — unconsciously rate budding female scientists lower than men with identical credentials. They judge women less capable, less worthy of hiring and less deserving of mentoring. And they propose starting salaries that are on average 14% higher for men than for women.

Are we really ready to take a look at ‘real women’?

Meg Urry

The new study is the first to be done on STEM faculty rather than, as is more typical, college undergraduates. Hundreds of earlier studies on undergraduates established that the name on a résumé affects our perceptions. And that women and men both act with unconscious bias to privilege those who already dominate a specific field of work, whether that means preferring a man’s résumé for a job in physics or a woman’s for a job in nursing.

When I was a young scientist, the dearth of female colleagues bothered me. So did the general lack of concern this raised in the scientific community. Occasionally, a colleague might ask why there weren’t more women in physics, but their favorite hypothesis didn’t hold water: that family priorities are to blame, because the years raising children often coincide with the crucial years as an assistant professor right before getting tenure.

But if family considerations slowed the advancement of women, why would women without children have similar career trajectories to those with children who remained full-time in the work force? It didn’t add up.

I also struggled to understand why I didn’t seem to belong in my field — why I was overlooked for leadership roles, why I was underpaid, why my suggestions were ignored until a male colleague proposed the same idea and why female scientists in general garnered a disproportionately small share of honors and awards.

Then I stumbled on a description about bias in Virginia Valian’s eye-opening book, “Why So Slow? The Advancement of Women.”

It was a classic Eureka moment. My observations of the underappreciation of women in science were suddenly explained by a simple idea: that each of us, having grown up in a society where men and women are not equal and do not populate the peaks of accomplishment equally, has an unconscious expectation that men are leaders.

Consider this riddle I heard as a kid: A man and his son are in a serious car accident. The man dies on the spot, and the son is rushed to the hospital. Upon entering the operating room, the surgeon says, “I can’t operate on this boy; he’s my son.”

I was utterly unable to figure out how the boy’s father could both be dead and about to perform surgery. Of course, the answer is that the boy’s mother was the surgeon. That possibility never crossed my young mind because, until I was in my 20s, I had never had a female doctor. So it’s not surprising that I developed an unconscious expectation that doctors would be men.

Opinion: Lift up women to lift the world

The social science research made all kinds of sense to me. Our experiences of life are turned into unconscious expectations that affect how we see others. When scholars reviewed a psychology research paper, for example, they scored it higher if the author’s name were male than if female. A male applicant for a job as police chief was rated higher than a woman, even though she had important qualifications for the job that he lacked. Similarly, a male applicant for a job as nursing supervisor was rated lower than the female applicant, even when he had the qualifications she lacked.

These experiments, which vary only the name at the top of the résumé, are repeatable. Time after time, the results are the same.

Perhaps the biggest worry is that people who swear they are objective are the most likely to make biased judgments. In several classic experiments, subjects were asked which criteria are most important for a particular job and then shown two résumés: one of the “wrong” gender who had all those qualifications and one of the “right” gender who lacked them. Yet the subjects rated the person with the “right” gender higher, i.e. they ignored the criteria they had earlier said were most important. And this tendency was greatest among those claiming objectivity.

Those who admitted at the outset that they were not objective were the least likely to shift criteria because of gender. It seems like people who are aware of the unconscious biases we all carry are less likely to make judgments influenced by that bias.

You can even check out your own objectivity on a website: implicit.harvard.edu. It’s a sobering experience. Mine is probably typical: I so deeply wanted to be unbiased, but while taking the online tests, I felt the impact of gender and race on my reactions. Mahzarin Banaji, the Harvard professor who started the website, says she too showed signs of bias when she took her own test. If she can admit that, perhaps the rest of us can be open to the possibility.

Opinion: Why do women still lag in journalism?

Objectivity is the core value in science. We are trained to be objective; to be a good scientist is to be objective. Any suggestion that a scientist is biased can be a serious insult.

But as the new study tells us, despite our best hopes, we scientists, like everyone else, expect men to be better scientists than women, and we project those expectations on the real people we encounter, not consciously and not meaning to discriminate yet evaluating women below their demonstrated potential.

This means most of us can’t be gender-blind or color-blind or unaware of difference. That’s not the goal right now. What we must do is acknowledge our inner biases and make sure we try our best to avoid them.

Maybe then it will become possible for bright young women to move forward in STEM careers as easily as the men do, making discoveries, improving our lives, changing our preconceptions and reducing our unconscious biases.

Follow us on Twitter @CNNOpinion

Join us on Facebook/CNNOpinion

The opinions expressed in this commentary are solely those of Meg Urry.



Article source: http://www.cnn.com/2012/10/01/opinion/urry-women-science/index.html

Tags: , , , , <BR/>

Solving the mystery of black holes

Editor’s note: Meg Urry is the Israel Munson professor of physics and astronomy and chairwoman of the department of physics at Yale University, where she is the director of the Yale Center for Astronomy and Astrophysics. This article was written in association with the Op-Ed Project.

Anchorage, Alaska (CNN) — In Ballroom E of the Den’aina conference center here Wednesday, a small group of astronomers and journalists listened to the NASA feed from Kwajalein island, between Hawaii and Australia, where a Pegasus rocket aboard an L1011 plane was about to launch the NuSTAR space telescope. I was there as a member of the science team for NuSTAR, which is part of NASA’s Small Explorer program

Many years in the making, NuSTAR carries an important scientific instrument designed to look for energetic X-rays from cosmic sources like black holes and exploded stars.

Most of us know about X-rays used for diagnostic imaging of broken limbs or for security scans at the airport. They are a high-energy form of light, energetic enough to penetrate clothing or flesh.

Meg Urry

But X-rays are also a form of light emitted from the hottest, most energetic matter in the universe. They tell us about enormous clusters of galaxies held together by gravity, for example, or about the chemical elements produced by exploding stars called supernovae.

X-rays also come from matter falling onto black holes, both the “small” black holes in our Milky Way galaxy, which are about 10 times the mass of our sun, and the “supermassive” black holes, which are millions to billions times larger than the sun and lie in the center of nearly every galaxy.

The launch of NuSTAR means there will be an important new observatory for studying the cosmos.

Black holes exert a strong gravitational pull on the stars and galactic matter around them. As material falls toward the black hole, it gains energy, just as any object gains energy when you drop it. The pull of a black hole is so strong that infalling matter heats up to millions of degrees, as hot as or hotter than the interior of the sun. All hot matter emits light, and the higher the temperature, the more energetic the light — hence the X-rays emitted by growing black holes.

NuSTAR is very well-matched to the temperature of material surrounding black holes. Moreover, it is the first space telescope capable of taking pictures in high-energy X-rays that penetrate even dense clouds of surrounding matter.

This means NuSTAR can see growing black holes regardless of their surroundings. Thanks to earlier observations with the Chandra X-ray telescope, along with the Hubble Space Telescope and the Spitzer Infrared Space Telescope, we know that most black hole growth occurs behind a thick cloud of gas and dust. It’s basically hidden from view, as if behind an opaque curtain. As a result, current estimates of the overall growth of black holes over cosmic time still involvs some guesswork. NuSTAR will change those guesses into firm measurements: the amount of black hole.

Fiona Harrison, a Caltech professor and leader of the NuSTAR project, worked with her team for more than a decade to develop the technology and design for NuSTAR. Wednesday morning, her hard work paid off.

Omar Baez, the NASA launch director, polled the launch team for readiness to launch. “Go,” they said, one after the other. “Ready for launch,” Baez said.

One final checklist, then, at last, the countdown: three, two, one — and the L1011 released the Pegasus rocket. It fired.

NuSTAR is launched.

Follow us on Twitter @CNNOpinion

Join us on Facebook/CNNOpinion

The opinions expressed in this commentary are solely those of Meg Urry.






Share this on:

Article source: http://www.cnn.com/2012/06/13/opinion/urry-nustar-telescope/index.html

Tags: , , , <BR/>

Two new Earths and the search for life


This chart compares the first Earth-size planets found around a sun-like star to planets in our own solar system.

Editor’s note: Meg Urry is the Israel Munson professor of physics and astronomy and chairwoman of the department of physics at Yale University, where she is the director of the Yale Center for Astronomy and Astrophysics. This article was written in association with The Op-Ed Project, an organization seeking to expand the range of opinion voices to include more women.

New Haven, Connecticut (CNN) — Americans were enthralled by fake reports of an alien invasion in the Orson Welles “War of the Worlds” radio broadcast on Halloween Eve in 1938. Hundreds of science fiction movies from the 1902 silent epic “A Trip to the Moon” (featured in the current film “Hugo”) to “Star Wars” to this year’s “Cowboys and Aliens” have fed a deep curiosity about intelligent beings elsewhere in the universe.

Hang on to your hats, because reality is starting to catch up.

On Tuesday, scientists reported evidence from the Kepler satellite that two Earth-sized planets are orbiting a nearby star about 1,000 light years from earth — practically our back yard compared to the extent of our Milky Galaxy, but far too distant to visit with current spacecraft.

These planets, named Kepler 20-e and Kepler 20-f, have sizes and masses similar to the Earth, and their host star is similar to our sun. But the resemblance ends there. Both orbit very rapidly — in 6.1 days and 19.6 days, respectively, compared to 365 days for an Earth year — so both are much closer to their star than the Earth is to the sun.

Meg Urry

This makes both planets way too hot to support life as we know it. Still, the pace of planet discovery is astonishing. Sometime in the next few years, scientists will likely discover Earth-like planets that are capable of supporting life.

Our sun is just one star among the hundreds of billions that make up the Milky Way galaxy, which itself is only one of hundreds of billions of galaxies in the universe. Over the last 15 years, astronomers have found hundreds of planets orbiting stars in our corner of the Milky Way and the list will pass 1,000 next year.

Planets are plentiful. Discoveries of planets are limited only by the capabilities of current telescopes and instruments and by the time needed to sample several full orbits of a planet around its host star.

Most “extra-solar planets” (or “exoplanets”) have been found by measuring tiny Doppler shifts (wavelength shifts) in the light of the host star. With this method it is easier to find heavy planets than light ones, and easier to find planets in close rather than distant orbits. So most of the planets found so far are big ones, similar to Jupiter or Neptune in our solar system, only orbiting much, much closer than the Earth to their host star. This is kind of like surveying your neighborhood for sumo wrestlers: You find far fewer than the number of other people who live there, and way fewer than the population of the world. So the 716 known exoplanets are just the tip of the iceberg.

The Kepler satellite uses a different method, based on transits of planets across the face of their host star. Visible light from the star dims very slightly, typically by 0.01% or less for an Earth-sized planet passing in front. Thus Kepler finds planets regardless of mass, although it more easily sees large planets (which cover more of the star’s surface and thus diminish the light more) and it only sees planets that cross the star as seen from the Earth (which most planets don’t).

By the way, you can help make these discoveries. At www.planethunters.org, a citizen science project started by colleagues of mine at Yale, anyone can search the Kepler data for signs of new planets. In particular, users might find unusual systems that the Kepler computer algorithms don’t search for. (For a fun Christmas holiday interpretation of the Kepler plots of star brightness over time, see this video.)

“Life” can mean anything from single-celled organisms to a walking, talking homo sapiens, or possibly something much stranger. For now, scientists are focusing on conventional carbon-based life because its signatures are well known.

Such life requires liquid water, meaning a temperature between freezing (32 F) and boiling (212 F). Planets too close to their star will be too hot, like the sweltering surface of Venus, which approaches the 800 degree Fahrenheit temperature of Kepler 20-f. Planets too far away have frigid surfaces, like Europa, a moon of Jupiter.

Temperatures that allow water to be liquid define the so-called “habitable zone” — like Goldilocks’ favorite porridge, planets in the habitable zone are not too hot, not too cold, but just right for life.

We haven’t yet found definitive signs of life elsewhere in the universe. But we can estimate that even the narrowest case of carbon-based life on an Earth-like planet orbiting a sun-like star in the habitable zone is likely, because planets are probably common around such stars, sun-like stars are common in our galaxy, and our galaxy is similar to many throughout the universe.

We also know the building blocks of life — amino acids and other organic compounds — form naturally from carbon, water and energy, as the chemists Stanley Miller and Harold Urey first showed more than 50 years ago.

Sadly, although life is likely to exist on exoplanets throughout our Milky Way galaxy, intelligent life is another thing altogether. Humans have lived at most a few hundred thousand years out of the Earth’s 4.6 billion year history — or less than 0.006% of the available time. In contrast, simple single-celled organisms probably formed several billion years ago, and thus have populated the Earth for more than three-quarters of its existence. This means it is overwhelmingly likely that the life we find elsewhere will be extremely primitive.

Face it: We’re not going to be IM’ing with aliens, nor should we expect an invasion or a rendezvous in outer space.

For now, we’re just looking for cells breathing and multiplying. Not “Another Earth” — more like “The Blob” (or, “The Green Slime”).

The opinions expressed in this commentary are solely those of Meg Urry.






Share this on:

Article source: http://www.cnn.com/2011/12/24/opinion/urry-two-earths/index.html

Tags: , , , , <BR/>

Keep Hubble successor on track


An artist's rendering of the James Webb Space Telescope, planned as the powerful replacement for Hubble.

Editor’s note: Meg Urry is the Israel Munson professor of physics and astronomy and chairwoman of the department of physics at Yale University. She is also the director of the Yale Center for Astronomy and Astrophysics. She previously worked as a senior astronomer at the Space Telescope Science Institute, which runs the Hubble Space Telescope for NASA. This piece was written in association with The Op-Ed Project, an organization seeking to expand the range of opinion voices to include more women.

(CNN) — Nearly everyone I meet has heard of the Hubble Space Telescope. Many have seen its beautiful images of the birthplace of new stars and planetary systems, or of the “gravitational lenses” that reveal a mysterious “dark matter” that dwarfs the amount of matter bound up in stars or galaxies.

This year’s Nobel Prize in physics went to three scientists who used Hubble to detect the mysterious dark energy — a sort of fifth fundamental force, previously unknown — that we now think is causing the accelerated expansion of the universe.

Hubble pictures and the knowledge the HST generates have changed our view of the cosmos and reached nearly every schoolchild in America.

Hubble passed its 20th birthday last year — young on a human time scale, but pretty elderly for a working spacecraft. Although frequent “body transplants” — that is, the installation of new cameras and other systems — keep Hubble acting like a teenager, it will reach the end of its useful lifetime by the end of the decade. What happens after Hubble takes its last picture?

Meg Urry

A decade ago, the astronomy and astrophysics community recommended as its very highest priority the James Webb Space Telescope to succeed Hubble. It will be a 6.5-meter foldable telescope — roughly the size of a typical classroom, and more than six times the area of the Hubble mirror. It is named after James E. Webb, who ran NASA from February 1961 to October 1968, a time of incredible scientific innovation and the Apollo moon program. The telescope named after him will answer new questions far beyond the capabilities of Hubble.

For example, JWST will look for signs of carbon-based life in the atmospheres of planets around other stars. The discovery of life elsewhere in our galaxy would be as mind-blowing as NASA’s Apollo-era picture of the “Earth-rise” as seen from the moon.

JWST will measure where and how chemical elements forged within stars were dispersed into space — the same carbon, oxygen and other elements that eventually formed our Earth and became (literally) part of us.

Because of its large foldable mirror, enormous solar shade and cryogenically cooled cameras, JWST will be able to see the very faint light from the very distant first galaxies, which formed 13 billion years ago, and perhaps the super explosions of the first stars formed in our universe.

Astronomy works a bit like archaeology, in that we directly observe the past. This is because light from the very distant universe takes billions of years to travel to our telescopes. So by observing the most distant galaxies, we can understand how galaxies formed and evolved to the present day.

There are also very practical reasons to care about such discoveries. Astronomy is a gateway science, attracting young minds. Astronomical instruments like Hubble and JWST push technical frontiers, developing new technologies that have other applications.

Last July, in a difficult budget environment, the House zeroed NASA’s budget for the JWST project. Three weeks ago, Congress restored JWST funding for this fiscal year but warned that its budget and schedule milestones would be closely monitored.

The cost over two decades is $8.8 billion dollars, including five years of operation, with nearly half already spent for technology development and construction. On Tuesday, the House Science, Space, and Technology Committee will hold a hearing at which leading scientists and JWST program managers will describe the scientific grasp of this advanced telescope and how the replanned mission can be achieved on time and within a strict cost cap.

In this fiscal environment, tough choices have to be made about which important and valuable government programs are not affordable. Each decade, the astronomical community sets priorities among many worthy projects competing for very limited dollars.

The 2001 survey, “Astronomy for the New Millennium,” named a space infrared telescope like the JWST as the No. 1 priority. NASA started the JWST project soon after, with Canada and Europe as partners, and now 70% of the telescope is already made or in fabrication. The next report, in 2010, “New Worlds, New Horizons,” described the essential role of JWST across the scientific landscape, from the “cosmic dawn” of stars and galaxies to the development of life on planets outside our solar system.

With a flagship mission like JWST, the U.S. can continue its international leadership in science and technology. Other countries like China and India are investing substantially in these areas, and a larger fraction of their college students major in science and engineering. Failing to complete JWST would disappoint our international partners and send a strong signal to the world that the U.S. is stepping back from forefront science.

Scientific discovery is not a luxury. Fundamental physics discoveries from early in the 20th century contribute greatly to our national economy, according to “Gathering Storm,” the National Academies’ report that warned that U.S. science, technology, engineering and mathematics need to be bolstered to ensure an good economic future. Even in a time of fiscal austerity, the U.S. needs this next-generation space telescope.

It is remarkable that from just a few hundred years of observing other stars and galaxies, astronomers have figured out billions of years of history. With JWST, we can push to greater distances and thus farther back in time.

Astronomical discoveries feed the fundamental curiosity of humans about how we got here, where we are going, and whether there is life beyond Earth. They add to the edifice of knowledge that is our legacy as humans. Hubble made incredible advances. With JWST the nation will go much further.

The opinions expressed in this commentary are solely those of Meg Urry.






Share this on:

Article source: http://www.cnn.com/2011/12/05/opinion/urry-james-webb-telescope/?hpt=hp_bn9

Tags: , , <BR/>