⏰ when
When was the first evidence for galaxies beyond the Milky Way published?
Quick Answer
Edwin Hubble published decisive evidence for galaxies beyond the Milky Way in 1924.
The Full Story
In 1924, Edwin Hubble used observations of Cepheid variable stars in the Andromeda Nebula to show that it was far outside the Milky Way. This settled the long-running debate about whether spiral nebulae were separate galaxies. The result expanded the size of the known universe enormously. It was one of the most important astronomical discoveries of the 20th century.
Key Facts
1.Published in 1924
2.Based on Cepheid variables in Andromeda
3.Showed the universe contains other galaxies
YouTube Angle
Suggested video title for this topic:
"The discovery that proved our galaxy is just one of many."
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