When1: 1926
When2: 1929
Who: Edwin P. Hubble [Hubble, Edwin P.]
What: astronomer
Where: USA
Detail: He lived 1899 to 1953, discovered galaxies (nebula) and classified them [1926], and compared galaxy recessional velocities and distances to formulate Hubble's law [1929, with Milton L. Humason].
Physical Sciences>Astronomy>History>Cosmology
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Date Modified: 2022.0224