On this day in 1875 – November 11th – American astronomer Vesto Slipher was born in Mulberry, Indiana.

Slipher was director of the Lowell Observatory in Arizona, and the first to discover the redshift of galaxies when he obtained their spectra and measured their radial velocities. This laid the foundation for the work that Edwin Hubble's work on the expansion of the Universe.

Mona Evans
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