Ancient Aliens: Did Aliens Terraform Earth? (Season 10) | History

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
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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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