How do you know? You been there? :^)
That's a good point. If the spectroscopy is flawed, that could just as easily be a giant lake of moose piss, rather than a sea of methane.
THe US exploded to nuclear bombs in space in either the late 50’s or early 60’s. There were explosions. How else do you account for mutant aliens like the Obamas, Clintons, Gore, Reid, Pelosi, Boxer, Franken and Frank?