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Invisible Asteroids Thought to be Threat

Invisible asteroids and other cosmic bodies made of a new form of matter may pose a threat to Earth, according to an Australian physicist.

Robert Foot of the University of Melbourne claims that a meteorite composed of mirror matter, which is an invisible dark matter that is said to make up over 95 percent of the universe, could impact the Earth without leaving behind any fragments.

An asteroid made up of mirror matter may have been responsible for the Tunguska blast, which destroyed acres of Siberian forest in 1908. Scientists have attributed the mysterious destruction to a meteor impact, but no traces of a meteor have ever been found.

Foot believes mirror matter asteroids might be a greater threat than normal asteroids. ?These objects may pose an overall greater risk than space bodies composed of ordinary matter,? he said. ?An approaching space body made of pure mirror matter would not be detectable?only after impact with the atmosphere would its effects be observable, but then it would probably be too late to do anything.?

To learn more about the history of earth impacts, click here.

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