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The idea that life begun on mars and travelled to earth is sometimes called panspermia. Here is the definition: Panspermia is a hypothesis that the seeds of life are prevalent throughout the Universe, and furthermore that life on Earth began by such seeds landing on Earth and propagating. The idea has its origins in the writings of Anaxagoras, but was first proposed in its modern form by Hermann von Helmholtz in 1879. Panspermia can be said to be either interstellar (between star systems) or interplanetary (between planets in the same solar system) There is as yet no compelling evidence to support or contradict it, although the majority view holds that panspermia - especially in its interstellar form - is unlikely given the challenges of survival and transport in space. For * "It's surprisingly easy to get material from Mars to Earth," says Gladman. "If you launch stuff off Mars, there aren't...

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