We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if ...
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Science history: Edwin Hubble uncovers the vastness of the universe with discovery of 'standard candle' — Oct. 5, 1923
On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star ...
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