-Aliens MIGTH be out there, simply by the mathematical chance involved. But this is not a 100% proove that they are there.
-But they will NOT come here! :
travelling takes so long, and they also have a life. Why should they depart from their civilization and waste their life, and the following generations, just to see if Earth does really contain something interesting.
They WILL NOT fly here. At least not the biologigal forms. Its would be simply rediculus.
The maximum they would send are automated beacons/sattelites or even a robot. But they have no chance to directly controll it, so it will be (at Maximum) some kind of AI sollution to gather and share Information.
So it could be that one of those sattelites noticed us, but did not have the methods to communicate with us. Or simply gathered some data and left. But they DEFINITELY did not build his sattelite to look for corn field (not portato or sheep fields or course), check if the density was propper, and then start jumping up and down to bend the plants into nice bubble-bobble shapes.
