In this section of a wiki article it talks about scientist finding amino acids in outer space, or at least complex molecules and such.
Also this video says how there is alcohol in Sagitarius B2.
How are these detected?
Since I know we haven't sent any probles there, the only logical answer is spectroscopy.
So what's happening is they are looking through a telescope, have the computer do some analysis, then they see this
and they say "hey, it's an amino acid, for sure!!"
Is that really all it takes and are these results that came from millions of kilometers away really accurate, unique, free of distortions, and reliable enough to say "it's an amino acid, for sure!"?
I'd have to imagine there might be interference and inaccuracies. I mean detecting the structure of something so tiny as a molecule from such large distances...? What's the magic they use or is it really just an educated guess and we're only like 53.7% sure that's what it is?