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showing that Hubble originally thought it was a nova, but eventually discovered that it varied in brightness like a Cepheid. The first image of H335H shows the glass side of the photographic plate, on ...

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Photo: Andromeda nebula plate with Hubble's handwritten circle around the variable star he discovered In 1919 American astronomer Edwin Hubble began work at the Mount Wilson Observatory in ...

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NASA's Hubble Space Telescope has unveiled the closest-ever look at a monster black hole devouring its cosmic surroundings. This supermassive black hole, at the heart of a quasar known as 3C 273 ...