Four chimes would have signaled the discovery of intelligent aliens.

Tarter, based in California, doesn't want her starry-eyed former intern to forget about intelligent aliens.

The Guild doesn't deal with intelligent aliens.

Scientists on Earth have been using this method, without success so far, to find evidence of intelligent aliens.

A representative of the Ferlang People will soon meet the first intelligent aliens our race has ever encountered.

None of the millions of dollars we've spent trying to communicate with intelligent aliens has paid a return.

Paolo said, Ashton-Laval has intelligent aliens.

And intelligent aliens, if they exist, could be sending a message, or spewing inadvertent signals, on any frequency.

And it has intelligent aliens.

If we wake up tomorrow morning to the news that we've made contact with intelligent aliens, how will religion respond?

Does humanity have a better chance of finding life on Mars in the form of microbes, than intelligent aliens in another galaxy?

Assuming I did have orders unknown to you, the discovery of this new species of intelligent aliens might have triggered a different portion of them.

"When we left Varandal a few weeks ago, the existence of intelligent aliens was still supposed to be secret."