How did life begin? There can hardly be a bigger question. For much of human history, almost everyone believed some version of "the gods did it". Any other ..... He also became interested in the chemistry of outer space, particularly what went on when the Solar System was first forming. read more
We do not know the answer to this question. What we do know is on Earth, life started within a few hundred million years of the time Earth cooled sufficiently for complex organic molecules to form. read more
Panspermia hypotheses propose (for example) that microscopic life-forms that can survive the effects of space (such as extremophiles) can become trapped in debris ejected into space after collisions between planets and small Solar System bodies that harbor life. read more