LONDON (Reuters) - Could SARS have come from outer space? Some scientists think so. Instead of jumping from an unknown animal host in southern China, a few researchers in Britain believe the virus that has baffled medical experts descended from the stratosphere. "I think it is a possibility that SARS came from space. It is a very strong possibility," Professor Chandra Wickramasinghe told Reuters. The director of the Cardiff Center for Astrobiology in Wales and a proponent of the theory that life on Earth originated from space, admits the theory defies conventional wisdom. But in a letter published in The...