"Earth's super backwater. One colonized planet, unless you count the fact that there's a rumor that Thanos came from one of the moons out there, but even that's just hearsay, and they haven't even developed the tech to get across their own tiny quadrant, much less anywhere else. Humans turn up every now and then, but it's usually 'cause they hitched a ride on a ship that got real bored and started trying to mess with the idiots."

And that's how crop circles and alien abductions happen. Bored alien college students.