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1
Jan Oort was a Dutch astronomer who established the Milky Way's rotation in the 1920s and proposed the distant comet reservoir called the Oort cloud.
2
Donald Lynden-Bell was a British theoretical astrophysicist who proposed in 1969 that quasars are powered by accretion onto massive black holes.
3
Harlow Shapley was an American astronomer who used globular clusters in 1918 to place the Sun away from the Milky Way's center.
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