The past is full of mystery, and the further back you go, the more mysterious it gets. When you go all the way back to the very beginning of life on Earth, there's a lot of questions up in the air. Did we evolve on land or water? What was the first animal to have eyes? Is it possible that octopuses are aliens who came to Earth in frozen, interplanetary eggs? What, why are you all laughing at us?
A Cosmic Creation Comedy
Not His First Space Rodeo
Are Humans Just Aliens? Panspermia Explained
Key Facts In This Video
A small percentage of meteorites that have impacted Earth came from Mars. 03:15
Necropanspermia is the idea that organisms needn't be alive after traveling through space and arriving on Earth for their genetic material to influence the evolution of life. 05:34
NASA has to meticulously examine its equipment so that it doesn't inadvertently carry microbes into space. 06:55
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