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Whose observations first showed that the Andromeda galaxy is moving toward the Milky Way?
Quick Answer
Vesto Slipher measured Andromeda’s radial velocity in the early 20th century. He found it was blueshifted, meaning it is approaching us.
The Full Story
Vesto Slipher was one of the first astronomers to measure galaxy spectra and their velocities. In the 1910s he found that the Andromeda Nebula has a strong blueshift, showing it is moving toward the Milky Way. His work on galaxy redshifts and blueshifts was essential evidence for later cosmology. Slipher’s velocity measurements were foundational for understanding the motion of galaxies in the universe.
Key Facts
1.Early 1910s spectroscopy
2.Andromeda is blueshifted
3.Pioneered galaxy velocity measurements
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Suggested video title for this topic:
"The spectroscopic clue that Andromeda is coming our way"
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