Rare supernova may have created ancient stone: study

An 'extraterrestrial' stone found in the Egyptian desert almost three decades ago could be the first piece of evidence found on Earth of a rare supernova explosion, a group of researchers has proposed.

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South Africa ,Great Sand Sea ,Egypt General ,Egypt ,Johannesburg ,Gauteng ,Alexandria ,Al Iskandariyah ,Egyptian ,Jan Kramers ,University Of Johannesburg ,