Cosmonaut Anton Shkaplerov suspects an extraterrestrial origin for bacteria found on the exterior of the ISS:
A Russian cosmonaut claims to have caught aliens. Cosmonaut Anton Shkaplerov says he found bacteria clinging to the external surface of the International Space Station that didn't come from the surface of Earth.
Shkaplerov told the Russian news agency that cosmonauts collected the bacteria by swabbing the outside of the space station during space walks years ago.
"And now it turns out that somehow these swabs reveal bacteria that were absent during the launch of the ISS module," Shkapkerov told TASS. "That is, they have come from outer space and settled along the external surface. They are being studied so far and it seems that they pose no danger."
A recent study suggests that interplanetary dust can transport microbes to or from Earth:
Astronomers have long believed that asteroid (or comet) impacts were the only natural way to transport life between planets. However, a new study published November 6 in Astrobiology suggests otherwise.
The study, authored by Professor Arjun Berera from the University of Edinburgh's School of Physics and Astronomy, suggests that life on Earth may have begun when fast-moving streams of space dust carried microscopic organisms to our planet. Berera found that these streams of interplanetary dust are not only capable of transporting particles to Earth, but also from it.
Space Dust Collisions as a Planetary Escape Mechanism (DOI: 10.1089/ast.2017.1662) (DX) (arXiv link above)
(Score: 2) by Immerman on Wednesday November 29 2017, @04:24PM (1 child)
If it has DNA as it's information storing molecule, we almost certainly share a common ancestor...
(Score: 3, Informative) by HiThere on Wednesday November 29 2017, @06:06PM
DNA wouldn't be quite sufficient to convince me of that. A genetic code with different nucleotides would convince me it was alien (unless it used RNA, of course). But DNA is one of the few things we know whose components exist in clouds of space dust. Of course, this could just be finding what we are looking for...
OTOH, the code that the ribosome uses to translate RNA messages into proteins appears to be totally arbitrary. It *that* matches, then it's almost certainly native, or else we aren't. And all known earth-native life forms use the same code (except for a couple of recent artificial ones).
Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.