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Whose discovery showed that the universe contains galaxies beyond the Milky Way?
Quick Answer
Edwin Hubble proved in the 1920s that the Andromeda “nebula” lies far outside the Milky Way. This showed the universe is much larger than previously thought.
The Full Story
Edwin Hubble identified Cepheid variable stars in Andromeda and used their brightness changes to measure its distance. In the mid-1920s, he showed that Andromeda is far beyond the Milky Way, making it a separate galaxy. That result revealed that the universe contains vast numbers of galaxies. It was one of the most important discoveries in modern astronomy.
Key Facts
1.Mid-1920s discovery
2.Used Cepheid variables
3.Andromeda is a separate galaxy
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Suggested video title for this topic:
"The discovery that made the universe explode in size"
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