Stories tagged xanthine

Jun
16
2008

Where are you going?: I'm going home.
Where are you going?: I'm going home.Courtesy Mila
New tests performed on a meteorite found in Australia suggest that life on earth could have had its start in space; it’s possible that the first components of self-replicating genetic material came from outer space.

This particular meteorite only struck Earth about 40 years ago, but new studies confirm that the molecules uracil and xanthine (which are found in our RNA) were present in the meteoritic fragments before human contamination.

Uracil and xanthine are “nucleobases,” and play an important role in the replication of DNA. Some have argued that these molecules could have originally formed on Earth, but these researchers claim that the atmospheric conditions on the planet at the time the first organic molecules are thought to have appeared would have prohibited a terrestrial origin. Going even further, they state that it’s possible—assuming that there are all these vital molecules floating out there on meteors—that life, or at least the key components for life (a big difference I suppose), could be widespread in the universe.

I prefer extraterrestrial life delivery by spaceship, but I guess I’ll take what I can get. Wild.