US astrophysicist who studied the rings of Saturn and the abundance and structure of nebulae. He demonstrated 1888 that nebulae resembled stars in their pattern of movement.
Keeler was born in La Salle, Illinois, and studied at Johns Hopkins
University and in Germany at Heidelberg and Berlin. He was appointed
astronomer at the Lick Observatory on its completion 1888; became professor
and director of the Allegheny Observatory 1891; and returned to the
Lick as director 1898.
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