Well, they may NOT wanna be found..

..and if they're super far advanced over us, they'd probably be able to go stealth on us.. I mean, we can do it to radar - I'm sure they could do it to whatever technology we have.. and, I absolutely wouldn't blame them for hiding from us - we can't even run our own planet worth a flip...

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..