Viewing a single comment thread. View all comments

spideywat t1_j6acp8z wrote

The only possibility that I have heard is perhaps Mars is where life started, got blasted off by an asteroid impact, fragments came to earth and restarted here as Mars became inhospitable. That was decades ago and we have done lots of studies on Mars since, so the plausibility of that I don’t really know.

2

starmartyr t1_j6cp14w wrote

There is the panspermia hypothesis. The idea is that microbial life could somehow be ejected from its home planet by something like a meteor impact. So you have a rock floating through space that contains a dormant single-cell organism. It floats around space for millions of years until it eventually lands on a planet with a habitable atmosphere. The organism evolves over millions of years and eventually, the planet is covered in diverse life forms. That could have happened on Earth. While this theory is interesting it doesn't do much to answer the question of the origin of life. It just passes the buck to somewhere else in the universe.

4

LaRoara42 OP t1_j6aur2q wrote

It's fun to wonder even if we can't know

2