Considering all of Hawking's work in cosmology, people are
understandably interested in his opinions on the possibility of alien life.
Hawking was invited to speak, and he mentioned his thoughts on the subject.
"Primitive life is very common," Hawking said,
"and intelligent life is very rare." Of course, he threw in his
characteristically sharp humor to say, "Some would say it has yet to occur
on Earth". He went on the say that humans should be wary
of exposure to aliens because alien life will probably not be DNA-based, and we
would not have resistance to diseases.
He expressed that, given the vastness of the universe, there
very well could be primitive alien life out there, and it is possible, other
intelligent life.
Hawking also did an episode on the possibility of aliens for
"Into the Universe with Stephen Hawking" on the Discovery Channel.
In this episode, he explains that aliens might use up their
own planet's resources and "become nomads, looking to conquer and colonize
whatever planets they could reach." Or, they could set up a mirror system
to focus all the energy of the sun in one area, creating a wormhole -- a hole
to travel through space time.
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