you have to be pretty damn self centered to think that theres one planet in the entire universe that has lifeforms and thats it ...
and just because we evolved the way we did doesnt mean other lifeforms need the same criteria to evolve to sentient form. evolution takes resources into effect ... if its a methane rich atmosphere and theres biologics that can live there then imo its only a matter of time before they evolve into something more that still utilizes methane breathing.
billions upon billions of stars and planets and events out there and we are the only ones here ... come on, be real