Astronomers propose finding alien civilizations by searching for unusually cold stars that could be surrounded by Dyson swarms—energy-harvesting structures first proposed by Freeman Dyson.

We often contemplate future civilizations focusing on science and exploration, but what would such a culture really be like, ...

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself?

A civilization capable of interstellar travel may also be one that has moved beyond conquest, excess and ecological ...

The molten planet, with an atmosphere rich in sulfur-bearing gases, is unlike anything astronomers have ever smelled.

Scientists have uncovered a hellish “lava world” where temperatures soar to a blistering 2,700 degrees Fahrenheit — hot ...

Add Yahoo as a preferred source to see more of our stories on Google. For decades, humanity has scoured the cosmos for any signs that we aren't alone in the universe. But now, researchers at the SETI ...

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In 1977, I saw "Star Wars" in a packed theater, where our collective jaws dropped. AI just killed what made that possible, but we can fight to save the magic.

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SETI researchers may have missed alien signals due to a cosmic phenomenon that distorts narrowband radio waves, new research says.