Jocelyn Bell Burnell is a British astronomer. She studied for her PhD @Cambridge_Uni, graduating in 1969. While there, Burnell helped construct an 81.5 MHz radio telescope that was designed to track quasars. Using this, Bell discovered the first pulsar. #STEMlegends #WomenInSTEM pic.twitter.com/VRhKe6ulpd

— RAS Women in STEM (@RAS_Women) January 31, 2019

Margaret Burbidge is an American astrophysicist. She co-authored the theory of stellar nucleosynthesis, showing how stars are fuelled. Women weren’t allowed to use high calibre telescopes and so she gained access to @MtWilsonObs by posing as an assistant#STEMlegends #WomenInSTEM pic.twitter.com/4zzHUPk5Bp

— RAS Women in STEM (@RAS_Women) January 30, 2019

Rosalind Franklin was a British chemist. She discovered the double helix structure of DNA @KingsCollegeLon in 1952. Her paper reached Acta Crystallographica one day before Crick and Watson completed their model, which had been inspired by Franklin’s.#STEMlegends #WomenInSTEM pic.twitter.com/aC8XBBi8Uo

— RAS Women in STEM (@RAS_Women) January 29, 2019

Valentina Tereshkova was a Russian cosmonaut and physicist.Tereshkova became the first woman and first civilian in space in 1963. She orbited the earth 48 times, logging more time in space than all the male US astronauts who had flown before her combined#STEMlegends #WomenInSTEM pic.twitter.com/V8tWCrbvaC

— RAS Women in STEM (@RAS_Women) January 28, 2019

Helen Quinn is an American physicist. She co-authored the first paper to suggest how the strong, weak, and electromagnetic forces can merge in a grand unified theory in 1974, and co-authored the best-known solution to the strong CP problem. #STEMlegends #WomenInSTEM pic.twitter.com/c7WcbcHpvM

— RAS Women in STEM (@RAS_Women) January 27, 2019

Moira Dunbar was a British-Canadian glaciologist. She became the first woman to conduct research from Canadian icebreakers in 1955. She served on numerous naval vessels and Air Force aircraft and was among the first women to fly over the North Pole. #STEMlegends #WomenInSTEM pic.twitter.com/lFYOH11Bdc

— RAS Women in STEM (@RAS_Women) January 26, 2019

Leona Woods was an American physicist.She earned her PhD @UChicago in 1938 and was the only woman in the group that built the first atomic bomb for the Manhattan Project. She later devised a way to use isotope ratios in tree rings to study climate change#STEMlegends #WomenInSTEM pic.twitter.com/y9YqXBsbuN

— RAS Women in STEM (@RAS_Women) January 25, 2019

Fabiola Gianotti is an Italian physicist. She joined @CERN in 1987 and became Head of the ATLAS experiment in 2009. In 2012, Gianotti announced that data from the ATLAS experiment and the CMS experiment at the LHC proved the existence of the Higgs boson.#STEMlegends #WomenInSTEM pic.twitter.com/Y7vmNIel1V

— RAS Women in STEM (@RAS_Women) January 24, 2019

Lene Vestergaard Hau is a Danish physicist. In 1999, Hau became one of the first to create a new state of matter - a Bose-Einstein condensate. Hau’s team were the first to transfer light into a matter wave and back using Bose-Einstein condensates in 2006#STEMlegends #WomenInSTEM pic.twitter.com/6pG5g7CDHE

— RAS Women in STEM (@RAS_Women) January 23, 2019

Carolyn Porco is an American planetary scientist. She was leader of the Imaging Team for the Cassini-Huygens mission to Saturn and is a member of the imaging team for New Horizons. She is also a Senior Research Scientist at @spacescienceins. #STEMlegends #WomenInSTEM pic.twitter.com/NfD2ZyOvXn

— RAS Women in STEM (@RAS_Women) January 22, 2019

Beatrice Tinsley was a British-born New Zealand astronomer. She gained her PhD from @UTAustin in 1966, specialising in the evolution of galaxies. She became a Fellow @RoyalAstroSoc in 1975, and the first woman professor of astronomy @Yale in 1978. #STEMlegends #WomenInSTEM pic.twitter.com/F4lsWdInIs

— RAS Women in STEM (@RAS_Women) January 21, 2019

Rhea Seddon (@RheaSeddon) is a medical doctor and @NASA astronaut. She was one of the first six women accepted by NASA and flew on three Space Shuttle flights: as mission specialist in 1985, and 1991, and as payload commander in 1993.#STEMlegends #WomenInSTEM pic.twitter.com/6r0KQKIlS6

— RAS Women in STEM (@RAS_Women) January 20, 2019

Debra Fischer (@debrafischer18) is an American astronomer. She is a professor of astronomy @Yale, where she launched @planethunters, and was part of the team that discovered the first known multiple-exoplanet system. She is PI with the N2K Consortium.#STEMlegends #WomenInSTEM pic.twitter.com/5QGCsTZIu4

— RAS Women in STEM (@RAS_Women) January 19, 2019

Jill Tarter (@jilltarter) is an American astronomer. She coined the term "brown dwarf" in her PhD thesis, @UCBerkeley in 1975. She has since worked as director of the Center for SETI Research @SETIInstitute, and holds the Bernard M. Oliver Chair for SETI#STEMlegends #WomenInSTEM pic.twitter.com/RoWe9EEfIy

— RAS Women in STEM (@RAS_Women) January 18, 2019

Marcia Neugebauer is an American geophysicist. She’s held several management positions @NASAJPL and made the first direct measurements of solar wind as an investigator on Mariner2. She’s developed instruments that have gone to the Moon and Halley's comet#STEMlegends #WomenInSTEM pic.twitter.com/UP9aoUPtYY

— RAS Women in STEM (@RAS_Women) January 17, 2019

Elsa Guðbjörg Vilmundardóttir was an Icelandic geologist. She became the first Icelandic woman to gain a degree in geology in 1963, while at @Stockholm_Uni. She then worked for the National Energy Authority (NEA) of Iceland until she retired in 2004.#STEMlegends #WomenInSTEM pic.twitter.com/v6f1Eb7bmC

— RAS Women in STEM (@RAS_Women) January 16, 2019

Jerrie Cobb is an American aviator and humanitarian. She was one of thirteen women who underwent the same physical tests developed by NASA for astronauts in 1959, known as Mercury 13. She ranked in the top 2% of all astronaut candidates of both genders. #STEMlegends #WomenInSTEM pic.twitter.com/LWpr0NU1zk

— RAS Women in STEM (@RAS_Women) January 15, 2019

Barbara Liskov is an American computer scientist from California. She is an Institute Professor and Professor of Engineering @MIT. She became one of the first women in the US to gain a PhD in computer science in 1968 @Stanford. #STEMlegends #WomenInSTEM pic.twitter.com/HZgs3FG9h4

— RAS Women in STEM (@RAS_Women) January 14, 2019

Betsy Ancker-Johnson is an American plasma physicist. She gained her PhD from @uni_tue in 1953 and then worked at @UCBerkeley and later @Boeing. She made a number of inventions relating to plasma physics and has at least seven patents. #STEMlegends #WomenInSTEM pic.twitter.com/4RyKOSlHED

— RAS Women in STEM (@RAS_Women) January 13, 2019

Margaret Kivelson is an American space scientist. She was PI on NASA’s #Galileo Orbiter, CI on NASA’s #Themis mission, CI on the magnetometer on @ESA_Clustera, and a member of the @CassiniSaturn and @JUICEmission magnetometer teams. #STEMlegends #WomenInSTEM pic.twitter.com/gw4pPtEZak

— RAS Women in STEM (@RAS_Women) January 12, 2019

Jane Luu is a Vietnamese American astronomer. She helped discover the Kuiper Belt as a PhD student in 1992 at @UCBerkeley and @MIT and co-discovered crystalline water ice on the Kuiper Belt dwarf planet Quaoar in 2004. #STEMlegends #WomenInSTEM pic.twitter.com/Tay9923ora

— RAS Women in STEM (@RAS_Women) January 11, 2019

Adelina Gutiérrez Alonso was a Chilean astrophysicist. She began working at the National Astronomical Observatory in 1949. She became the first Chilean to gain a PhD in astrophysics in 1964 and was the first woman member of theChilean Academy of Sciences#STEMlegends #WomenInSTEM pic.twitter.com/5Zsd04bOMB

— RAS Women in STEM (@RAS_Women) January 10, 2019

Marion Dietrich was an American mathematician and pilot who successfully trained as an astronaut as part of Mercury 13 in 1959 with her identical twin sister Janet. Dietrich gained degrees in mathematics and psychology from @UCBerkeley in 1949. #STEMlegends #WomenInSTEM pic.twitter.com/oSCL5FQS5Z

— RAS Women in STEM (@RAS_Women) January 9, 2019

Janet Dietrich was an American pilot who successfully trained as an astronaut as part of Mercury 13 in 1959 with her identical twin sister Marion. They were the only girls in their High School aviation class and competed together in professional races. #STEMlegends #WomenInSTEM pic.twitter.com/TcqXdtSfP8

— RAS Women in STEM (@RAS_Women) January 8, 2019

Fay Ajzenberg-Selove was an American physicist. She gained a PhD from @UWMadison in 1952 and made annual reviews of the energy levels of light atomic nuclei. She was the first full-time female faculty member at @haverfordedu in the 1960s.#STEMlegends #WomenInSTEM pic.twitter.com/Czoel4xsxP

— RAS Women in STEM (@RAS_Women) January 7, 2019

Myrtle Cagle was an American pilot who trained as an astronaut as part of Mercury 13 in 1959. She learnt to fly at 14, making her the youngest pilot in North Carolina and possibly the US. In 1953, she became one of the first five women to pilot a jet.#STEMlegends #WomenInSTEM pic.twitter.com/D9IeEShOIZ

— RAS Women in STEM (@RAS_Women) January 6, 2019

Adrienne Stiff-Roberts is an engineer. She gained her PhD at @UMich in 2004, researching quantum dot photodetectors. She previously worked at @NASAAmes and is currently an Associate Professor of Electrical engineering @DukeU. She is a member of @NSBPInc #STEMlegends #WomenInSTEM pic.twitter.com/T2b5pkEMD4

— RAS Women in STEM (@RAS_Women) January 5, 2019

Bernice Steadman was an American pilot who successfully trained as an astronaut as part of Mercury 13 in 1959. She opened her own flight school where over 200 men trained to become airline pilots and co-founded @WomenintheAir.#STEMlegends #WomenInSTEM pic.twitter.com/1ZvKlPbCmY

— RAS Women in STEM (@RAS_Women) January 4, 2019

Milla Baldo-Ceolin was an Italian particle physicist. She co-discovered the antilambda particle in 1957 and became a professor of physics @UniPadova in 1958. She worked on neutrino physics @CERN using the Super Proton Synchrotron and bubble chamber.#STEMlegends #WomenInSTEM pic.twitter.com/RN4PWvUr4F

— RAS Women in STEM (@RAS_Women) January 3, 2019

Sulamith Goldhaber was an American physicist. She was born in Austria and grew up in Palestine. She gained her PhD from @UWMadison in 1951 and worked with Gerson Goldhaber, they were the first to measure and observe many types of nuclear interactions#STEMlegends #WomenInSTEM pic.twitter.com/oqPripEMeP

— RAS Women in STEM (@RAS_Women) January 2, 2019

Sonja Ashauer was a Brazilian physicist. She became the first Brazilian woman to earn a PhD in physics in 1948. Her thesis was on quantum electrodynamics and she was supervised by Paul Dirac @Cambridge_Uni. She died unexpectedly that year.#STEMlegends #WomenInSTEM pic.twitter.com/NmNXcUZwUm

— RAS Women in STEM (@RAS_Women) January 1, 2019