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> I would think an alien spacecraft carrying the energy and resources needed for interstellar travel (including the return trip) would be pretty obvious and det
by kelipso 3y ago
> I would think an alien spacecraft carrying the energy and resources needed for interstellar travel (including the return trip) would be pretty obvious and detectable even by amateur astronomers.
I don't think this is true. If an alien ship landed on the moon, we won't know about it. No equipment or resources put in to monitor something like that. Much less all the other planets, moons, and asteroids in the solar system.
- DougN7 3y agoEven if we couldn’t detect them, with tech as advanced as they would have to have, are they going to be crashing on our planet so often that we need a full on program for collecting them? If it happened once, maybe. Multiple times with that level of tech? No way.
- thefurdrake 3y agoMaybe they've been in space so long that atmospheric flight is problematic for them? That seems unlikely, though. My personal, unsupported belief, is that if there are aliens, Earth is like a nature preserve, and all the crashed ships are idiot tourists who, despite being told not to touch the buffalo, desperately want to touch the buffalo.
- Fatnino 3y agoAny craft coming from outside our solar system and trying to stop inside it would leave a huge energy signature as it slows from some significant fraction of c.