Seth Shostak

While alien life can be seen nightly on television and in the movies, it has never been seen in space. Not so much as a microbe, dead or alive, let alone a wrinkle-faced Klingon.

From Enceladus and Titan to Europa and Mars, here are the likeliest spots to find extraterrestrials.

SETI senior astronomer Seth Shostak gives an insider's look at the new sci-fi thriller "Apollo 18."

Strip mining an extrasolar planet, as in James Cameron's movie Avatar, would most likely never be cost effective.

The possibilities for alien life will be up for discussion at the upcoming SETIcon.

In "Skyline," a weird assortment of slimy extraterrestrials from an unspecified world plummet into downtown Los Angeles.

In "Skyline," a weird assortment of slimy extraterrestrials from an unspecified world plummet into downtown Los Angeles.

Will the World End in 2012?

The possibilities for alien life will be up for discussion at the upcoming SETIcon.

Strip mining an extrasolar planet, as in James Cameron's movie Avatar, would most likely never be cost effective.

Will the World End in 2012?

A comet hitting Earth would seem to bring only death and destruction, but one group is studying how such an impact could promote certain necessary chemical steps in the origin of life.

New movie takes alien from outer space and puts them in the ghetto.

NASA's Kepler Telescope is engaged in the ultimate staring contest.

Is there reason to think that actual aliens from distant worlds would be similar in appearance to humans?

With the conversion to digital TV, zillions of aliens won't be able to tune in.

New instruments such as NASA's Kepler space telescope may soon reveal whether Earth-like worlds are common.

The best way to air your wacky theories is to write them down, SETI says.

Scientists recover meteorites from an asteroid first spotted in space.

Absolute proof of alien life, however small, would have big impacts on Earth.

We’re destined to go to the stars, but getting humanity there is tricky.

A half-century later, Klaatu and Gort are back.

How do we know they're looking at us when we're looking at them?