Blue Origin's next suborbital flight is scheduled to launch on Saturday (June 21), carrying a private crew of six.

"These small galaxies punch well above their weight."

The monsterous 85-mile-wide comet C/2014 UN271 isn't just the largest icy rock in the Oort Cloud, it's the second most distant that is chemically active.

Auroras may be visible from Alaska to New Hampshire as geomagnetic activity remains unsettled.

Find out what you can see in the night sky for tonight, from planets and stars to dazzling meteor showers.

Using the XMM-Newton telescope, astronomers have discovered a vast 23 million light-year-wide tendril connecting galactic clusters and containing much of the universe's missing matter.