Extraterrestrial Stone Found in Egypt May Be First Evidence on Earth of Rare Supernova - ScienceAlert
May 18, 2022 49 secs
'Standard candle' (or type Ia) supernova explosions are some of the most energetic events in the Universe, happening when a dense white dwarf star subsumes another star.

The researchers were also able to show that Hypatia didn't match what would be expected if it came from a type II supernova – it has too much iron relative to silicon and calcium – and that leaves the intriguing possibility that this is a leftover from a type Ia supernova, and the first to be found on this planet.

"If this hypothesis is correct, the Hypatia stone would be the first tangible evidence on Earth of a supernova type Ia explosion," says Kramers.

Of the 15 elements analyzed in the stone, several matched what would be expected if the object had come from a dense white dwarf star explosion.

"Since a white dwarf star is formed from a dying red giant, Hypatia could have inherited these element proportions for the six elements from a red giant star," says Kramers


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