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Henrietta Leavitt and the end of the universe
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Is the Universe Expanding Now?
In the 1990s, Henry Edelovet invented a yardstick to measure the universe. Hubble used that yardstick to figure out that our galaxy is not the entire universe. And then Hubble again figured out that the universe was actually expanding. This showed us that the universe wasn't static, that it actually had a beginning.
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