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Whose discovery showed that the universe is expanding?
Quick Answer
Edwin Hubble showed that galaxies are generally moving away from us, meaning the universe is expanding. He published this result in 1929.
The Full Story
Edwin Hubble used observations of Cepheid variable stars to measure distances to galaxies and combined them with redshift measurements. In 1929 he found that farther galaxies are receding faster, now called Hubble’s law. This provided the first clear observational evidence that the universe is expanding. His work transformed cosmology and supported the idea that the universe had a beginning.
Key Facts
1.Published in 1929
2.Galaxies show redshift-distance relation
3.Hubble’s law links speed and distance
YouTube Angle
Suggested video title for this topic:
"The discovery that proved the universe is stretching itself apart"
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