The search for life is never going to be an easy thing, but the questions that you learn can tell you a lot more about planets and about the solar system. Unexplainable's final episode of our lost world series will air next week. Next week: What killed venus? Earth and venus really like twins, really. They have been born at the same time and made of the same stuff. Yet earth is a paradise, so why do we have a paradise next to a paradise?
Mars was once a very different planet, with rivers, lakes, and — potentially — life. NASA’s latest Mars rover is on a mission to find traces of past life. What happens if it does?
This is the third episode of our new four-part series, Lost Worlds.
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