Optical images of the Crab Nebula taken by Keeler in 1899 were used to determine the proper motion of the Crab Pulsar
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← James Edward Keeler timeline
Optical images of the Crab Nebula taken by Keeler in 1899 were used to determine the proper motion of the Crab Pulsar
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-23 from Wikipedia. The archived copy is preserved so this citation survives link rot.