"have played a prominent role in astronomical thought since the discovery by in 1845 of the spiral structure of the ... Through the work of , , , and especially Hubble, by the late 1920s, it became known, and not just speculated, that such spirals were disk-like stellar systems coequal to our own Milky Way system. From the optical study of the kinematics of stars in the solar neighborhood, (1927) and Jan Oort (1927) deduced that the flattening of the galactic disk is due to rotation, and that this rotation occurred differentially, with the stars near the galactic center taking less time to go once around the center than the material farther out."
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Harvard University alumniMassachusetts Institute of Technology alumniAstronomers from the United StatesAstronomers from ChinaMembers of the United States National Academy of Sciences
Original Language: English
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(quote from p. 667)
https://en.wikiquote.org/wiki/Frank_Shu
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Frank Shu
(徐遐生; June 2, 1943 – April 22, 2023) was a Chinese-American astrophysicist, astronomer, and author. Known with his doctoral advisor and collaborator for the , he was elected in 1987 a Member of the and in 1992 a Fellow of the . He received in 1977 the , in 1996 the , in 2000 the , and in 2009 both the and the .
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