Stephen Hawking pushing Alien Simulacra

Wow, just wow, now they have the worlds top physicist pushing the alien simulacra. See for yourself

http://www.msnbc.msn.com/id/36769422

Nobody questions Hawking's sanity. Last time he made news he said 'we must leave the Earth in 100 years' because of climate change.

"Hawking says Earth is only 200 years old."

He speculates most extraterrestrial life will be similar to microbes, or small animals — but adds advanced lifeforms may be "nomads, looking to conquer and colonize." how does he know that?