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Zhin🎭
@zhin
The expansion of the universe is a fact that has been proven for a long time. But the difficulty in measuring the distance of galaxies, independent of their reddening, is such that determining the current rate of expansion, Hubble's constant, has become an exhausting and long process in the last 50 years.
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Evelyn 🎩🔵🎭
@evelyn1986
😀 🎭
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