Cosmic ancestry is a serious scientific theory, that proposes living organisms were 'seeded' on Earth as 'passengers' aboard comets and meteors. Such incoming organisms would have to survive the heat of re-entry.
Ocean Surface (Tidal Pools) Theory:
This popular theory suggests that life arose in a tidalpool, pond or on moist clay on the primeval Earth. Gases from volcanoes would have been energised by U.V. light or electrical discharges to form prebiotic molecules in froth. These molecules are seem to be the starters of life.
These are the two most common theories of the Origin of Life. Which do you agree on?
I've pretty much given up on these topics, there are so many theories out there and anyone can make a theory. We can make educated guesses, but the end we will never be 100% of a conclusion. Im still sticking to the theories I feel most strongly about.
The first theory sounds slightly silly at first, but on second thought it's kind of like self-pollination of trees. I need to watch that series when I have time.
As fir the second theory that's what I learned in biology and it really makes sense, and I remember two guys made an experiment re-creating the atmosphere of the ancient earth and with the proper energy they formed an organic protein...