2017-3-22 : 7 Alien ‘Earths’ May Be Swapping Life via Meteorites

The discovery of alien life would be revolutionary. But what if we uncovered it on two—or even seven—planets all orbiting the same star?

“In a single planetary system, like TRAPPIST-1, the interchange of bacterial life is almost inevitable,” says the University of Buckingham’s Chandra Wickramasinghe.


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