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Astronomers discover a star in Andromeda that's exploded every year for millions of years. During these "nova" eruptions, the star brightens by a millionfold as it ejects material at about 3% the speed of light. Over time, this has left behind one of the largest remnants of debris ever observed.
Astronomers discover a star in Andromeda that's exploded every year for millions of years. During these "nova" eruptions, the star brightens by a millionfold as it ejects material at about 3% the speed of light. Over time, this has left behind one of the largest remnants of debris ever observed.
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