Would you invite this alien to your home planet?
Because, according to Stephen Hawking, any successful attempt to contact extra-terrestrial life would probably result in something horrible like humans being farmed out as food, rather than the touching sort of human/alien contact portrayed in movies like Cocoon.
Aliens are out there... and we need to stop trying to talk to them, he says.
"We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet," the award-winning British scientist said in the series for the Discovery Channel.
To drive the point home, Hawking argued that aliens visiting Earth would likely be the same as when explorers first arrived in the New World.
"If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans," he said.
[snip]
Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach," he said, arguing that they may have taken to the stars because they depleted resources on their home world.