An extraterrestrial rock that was found in more than 25 years ago may be the first evidence on Earth of a rare supernova explosion, scientists have claimed.Researchers analysed the Hypathia stone and found that its chemical makeup and patterning suggest it contains bits of the dust and gas cloud which surround a 'standard candle' (or type Ia) supernova.These stellar explosions, which are some of the most energetic in the Universe, happen when a dense white dwarf star gobbles up another nearby star.
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