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Space invaders

作者:谷梁愆慝    发布时间:2019-03-06 08:08:23    

By Ian Sample A THIRD of a tonne of extraterrestrial bacteria could be raining down on Earth every day. The controversial claim comes from scientists who say they have found microbes living more than 40 kilometres above the Earth’s surface. Ever since the 1970s astronomers Fred Hoyle and Chandra Wickramasinghe have backed the idea that Earth was seeded with life from space. They think microbes hitchhike around the Universe on comets. Although the bacteria would spend much of the time frozen, radiation from the Sun would warm a comet’s surface when it got close enough,

 

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