⏰ when
When was the first galaxy redshift measured?
Quick Answer
In the 1910s, Vesto Slipher measured the first major galaxy redshifts, revealing that many galaxies are moving away from us.
The Full Story
In the 1910s, Vesto Slipher measured the spectra of spiral nebulae and found large redshifts in many of them. These measurements showed that several galaxies were receding at high speeds. Slipher’s work provided the critical velocity data that later supported the expanding-universe idea. It was a major early step toward modern cosmology.
Key Facts
1.Measured in the 1910s
2.Astronomer: Vesto Slipher
3.Redshifts showed galaxies moving away
YouTube Angle
Suggested video title for this topic:
"The first clue that the universe is expanding came from light itself."
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