It's amazing we can detect comets in distant solar systems at all! These are the first 3 exocomets found in data gathered by TESS, NASA's newest planet-hunter. The comets orbit the famous star Beta Pictoris.

What happens when young stars brush past each other? A lot, according to a new study suggesting our solar system contains comets stolen from another star 4.5 billion years ago.

"Here is the video I shot, be prepared to be mind-blown!" Marco Langbroek wrote on his website SatTrackCam Leiden (b)log, where he shared an amazing capture of dozens of SpaceX Starlink internet satellites chugging along, in a straight line, across the heavens.

Want to send your name to Mars on NASA's next rover mission in 2020? You'll get your name etched on a microchip affixed to the rover - and a souvenir boarding pass. Here's how.

Does Pluto have an ocean? That idea seems preposterous at first, but a new study adds to the growing evidence for a subsurface ocean on this distant dwarf planet ... and explains how it stays liquid.

New research suggests that a wayward dwarf planet collided with the moon in the early history of the solar system, causing the stark difference between the moon’s heavily-cratered far side and the lower-lying open basins of its near side.

Early results from China's historic 1st landing on the moon's far side. Chinese scientists have used in situ data from a far side crater to identify materials on the moon's surface that originated deeper inside the moon.

NASA released before and after images of the spot on the moon where Israel’s Beresheet spacecraft crash-landed on April 11.

A new study shows that Mars has a unique water vapor cycle that occurs only once about every 2 years. The cycle might help explain how Mars lost most of its water.

A cosmic collision in action. Read more about what happens when 2 galaxies sideswipe each other.