Who was Vera Rubin?

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Vera Rubin provided the first observational evidence that supported of the existence of dark matter—the invisible material that makes up more than 80 percent of the mass of the universe.
Vera Rubin at Lowell Observatory with Kent Ford in white helmet.
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1965: First woman staff scientist at the Department of Terrestrial Magnetism

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1970s: Discovered evidence for dark matter

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1993: Received the U.S. National Medal of Science

Vera Rubin (July 23, 1928 – December 25, 2016) was a pioneering astronomer whose work transformed our understanding of the cosmos. She provided the first observational evidence for the existence of dark matter—the invisible material that makes up more than 80% of the universe’s mass—reshaping modern astrophysics.

In addition to her scientific breakthroughs, Rubin was a passionate advocate for women in science. She championed access and inclusion at the Palomar Observatory, the Cosmos Club, Princeton University, and the Pontifical Academy of Sciences, where she advised the Pope on advancing gender equity in the scientific community.

Rubin spent the majority of her career as a staff scientist at Carnegie Science's Department of Terrestrial Magnetism in Washington, DC—now part of the Earth and Planets Laboratory.

An Interesting Voyage

My life has been an interesting voyage. I became an astronomer because I could not imagine living on Earth and not trying to understand how the Universe works.

WRITTEN BY VERA C. RUBIN // ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS Vol.49:1-28 (Volume publication date September 2011)
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Vera Rubin as a Child Peers THrough Telescope

Early Ambitions

Born in Philadelphia and raised in Washington, DC, Vera Rubin developed a fascination with the night sky as a young girl. At age 14, she built her first telescope using cardboard tubing and a store-bought lens, aiming it out of her bedroom window to track the stars. That curiosity never faded.

She earned her undergraduate degree from Vassar College—where she was the only astronomy major in her class—followed by a master’s from Cornell and a Ph.D. from Georgetown University in 1954. Throughout the 1950s and early '60s, Rubin balanced her scientific aspirations with family life, teaching, and researching while raising four children. However, by the mid-1960s, she was ready to return fully to her passion for unraveling the universe's mysteries.

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Vera Rubin with DTM Carnegie Science Truck

A Seat at the Table

When Vera Rubin approached Carnegie’s Department of Terrestrial Magnetism in 1965, she was eager for a full-time return to hands-on research. The department was in the midst of a technological turning point, thanks to Kent Ford’s development of the image-tube spectrograph—an innovative instrument that amplified faint light from distant celestial objects, dramatically improving observational efficiency.

After asking for a job, Rubin was invited to the department’s community lunch, where Director Merle Tuve asked her to give an impromptu talk at the blackboard about her galaxy rotation research. Her command of the subject impressed Tuve, who handed her one of Ford’s photographic plates and asked her to analyze the stellar velocities it captured.

Rubin’s precise measurements and quick turnaround demonstrated her skill. Soon thereafter, she was hired on as the department’s first woman staff scientist. Her arrival marked not only a milestone in institutional inclusion but also the beginning of a collaboration that would challenge the fundamental assumptions of astrophysics.

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Vera Rubin Galaxy Velocity Graph

A Rotational Surprise and Unseen Forces

Working alongside Kent Ford, Rubin began studying the rotation of spiral galaxies, turning her sights on Andromeda. 

Expectations were straightforward: stars farther from a galaxy’s center should orbit more slowly—similar to how planets in our Solar System orbit the Sun. But Rubin’s observations told a different story. Across the galaxy, stars at the edges were moving just as fast as those near the center. The data pointed to a stunning conclusion: most of the galaxy's mass was unaccounted for! 

Vera Rubin Measuring Slides

Rubin's Case for Dark Matter

Rubin and Ford’s 1970 paper on the Andromeda Galaxy’s “flat rotation curve” kicked off a scientific revolution. Over the next decade, they collected data on dozens of galaxies, consistently finding that stars at the edges were moving just as fast as those near the center—evidence for what Rubin called “non-luminous matter.” By 1980, the case for dark matter was undeniable. Rubin presented the findings to the International Astronomical Union, challenging astronomers to rethink the very structure of the universe.

Women in Science Steering Committee

Lifting Others as She Climbed

Throughout her career, Vera Rubin challenged exclusionary practices and worked to make astronomy more inclusive for women.

In 1965, she became the first woman officially invited to observe at Palomar Observatory. Later, she used her role in the Pontifical Academy of Sciences to advocate for greater representation of women in science on the global stage. She also pushed back against exclusionary policies at places like the Cosmos Club in DC, which had long barred women from membership.

Within the American Astronomical Society (AAS), Rubin played a foundational role in advancing gender inclusion. She co-authored a key 1973 report on the status of women in astronomy, helping to establish what would become the AAS Committee on the Status of Women in Astronomy—an ongoing force for change in the field.

Rubin’s advocacy extended to individuals, too. She mentored and supported scientists like Sandra Faber, Neta Bahcall, and Alycia Weinberger—offering guidance, writing recommendations, and regularly nominating women for awards.

Through her actions, Rubin helped change the face of astronomy—and expanded who could shape its future.

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Vera Rubin - Cake

A Legacy Written in the Stars

By the time she passed away in 2016, Vera Rubin had observed over 200 galaxies and revolutionized astrophysics. Her legacy lives on in the observatory that bears her name, in the scientists she mentored, and in the ever-expanding research into the mysteries of dark matter.

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In Memoriam

Remembering Vera