Vesto Melvin Slipher17 September 1912
Measures the Doppler shift of M31 and finds a very large approach velocity, the first radial-velocity measurement made for a spiral nebula.
United States · Science / Astronomy. Chronological records rendered directly from the World History Database.
Measures the Doppler shift of M31 and finds a very large approach velocity, the first radial-velocity measurement made for a spiral nebula.
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