Clouds of alien life forms are sweeping through outer space and infecting planets with life. The idea that life on Earth came from another planet has been around as a modern scientific theory since the 1960s when it was proposed by Fred Hoyle and Chandra Wickramasinghe. At the time they were ridiculed for their idea -- known as panspermia. But now, with growing evidence, it's back in vogue and even being studied by NASA.
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