Stephen Hawking: Aliens may exist and could be dangerous

[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/US/04/22/earth.day.at.40/story.earthrise.nasa.jpg caption="There's a good chance we don't want aliens to come calling, Hawking says." width=300 height=169]

So, the world's most famous astrophysicist has some advice about whether we should or shouldn't try to make contact with creatures from outer space:

Don't do it, Stephen Hawking advises.

It would be much better for humans to keep a low profile, he says. There's a good chance we don't want aliens to come calling, Hawking says, because they very likely wouldn't be the cuddly, ET types we hope for.

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