This week we look at whether there was a technological civilization on earth before humans. And how the particular way the moon was created may have helped the development of life on earth. Here's science editor brian resnick, and nassa astrobiologist Lindsey hayes to help you understand our solar system.
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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