Vesto Slipher
American astronomer (1875–1969)
United StatesSummary
Updated 2026-05-29
Astronomer who clocked the universe's exit velocity by measuring galaxy redshifts in the early 1900s—basically proved the cosmos is expanding before anyone else caught on.
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Vesto Melvin Slipher was an American astronomer who performed the first measurements of radial velocities for galaxies. He was the first to discover that distant galaxies are redshifted, thus providing the first empirical basis for the expansion of the universe. He was also the first to relate these redshifts to velocity.
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