Cometary Oxygen Is Good News, Bad News For Alien Life
Researchers have discovered molecular oxygen on comet 67P/C-G, but it's not making the search for extraterrestrial life any clearer.By Evan Thomas | October 31, 2015
Scientists have discovered the unexpected on comet 67P/C-G: molecular oxygen.
The presence of this oxygen could increase the odds of finding extraterrestrial life as we might recognize it — but its very existence could also poke holes in those same theories. This is harder than it looks. (Video via European Space Agency)
As recently as last year, finding methane and oxygen together was thought to be a reliable biosignature — a good indicator that biological activity could happen or is happening.