In the video embedded below, astrophysicist Neil deGrasse Tyson speculated about whether or not it's possible that aliens have already studied Earth and its inhabitants and decided we're not interesting or advanced enough to talk to.
"People ask, 'If life is teeming across the galaxy, where are they?'" said deGrasse Tyson. "How come they're not just walking into the front door of the White House or visiting us here in New York in Times Square?"
There's always the chance, he joked, that they already came by Times Square or landed at Comic Con and nobody noticed them because everybody there already looked pretty weird.
"Our hubris forces us to think of ourselves as intelligent," he said on a more serious note. Compared to aliens, though, we might not be so bright.
"So, I wonder if in fact, we have been observed by aliens and upon close examination of human conduct and human behavior, they have concluded that there is no sign of intelligent life," deGrasse Tyson said.
Some scientists, like Stephen Hawking, have said that humans should be wary of contact with aliens because when civilizations meet, it's typically the less-advanced civilization that gets trampled, colonized and preyed upon.
"They were either completely wiped out or subjugated or enslaved or whatever," de Grasse Tyson said. "So I think his fear about aliens is a reflection of his actual knowledge about humans, how humans treat each other. Not real knowledge about how actual aliens would treat us."
Watch the video, embedded below: