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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 ...

Our Universe is Held Together By Invisible Galactic Glue—And We Wouldn’t Exist Without It

According to the model, dark matter may have started as particles that were hot, light, massless, and fast. As the universe ...