WASHINGTON (Reuters) - It is a planet astronomers say probably should not even exist. Researchers said on Monday they have spotted a truly extreme planet beyond our solar system, a blazingly hot world ...

If you looked up in the sky Thursday in the Chicago area, chances are you might have witnessed a seemingly unusual sight. Viewers started reporting to NBC Chicago Thursday afternoon what they called ...

New research is focusing on the sulfuric-acid clouds of Venus as a potential abode for life. The new Venus study calls for the start of a new branch of astrobiology and a new branch of organic ...

Don't worry, we're not being invaded by aliens — not yet anyway; this "UFO" is nothing more than a rare cloud. Looking like something out of an alien invasion movie, the massive 'lenticular cloud' ...

For more than a century, popular culture has trained us to picture extraterrestrials as bug-eyed, bipedal “little green men” ...

These noctilucent clouds, reflecting light from the sun after sunset, have been visible in Martian skies for the past four fall seasons. Credit: NASA / JPL-Caltech / MSSS A rover got a new view of ...

The James Webb Space Telescope has made the first direct analysis of clouds on a nearby alien world. These aren’t just made of water vapor but also sand, which would move around the planet much like ...

James Webb Telescope: The most ambitious and powerful space observatory ever built is set to launch Researchers believe that there could be potential lifeforms producing ammonia in the clouds of Venus ...