If Mars can be colonized using a hypothetical process called terraforming, some Ancient Astronaut Theorists believe extraterrestrials could have seeded earth with life in this clip from Season 10, Episode 6, "The Other Earth." #AncientAliens Subscribe for more from Ancient Aliens and other great ...

Some Ancient Astronaut Theorists suggest that deep within our own planet could be another earth in this clip from Season 10, Episode 6, "The Other Earth". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about ...