The Chandra X-ray Observatory marked its 25th anniversary with a release of never-before-seen images. But budget cuts may cause the observatory’s days to be numbered.

Perched in orbit more than a third of the way to the moon, the Chandra Observatory is the most powerful X-ray telescope ever built. Since its launch in 1999, Chandra has allowed scientists to peer ...

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.

To celebrate the 25th anniversary of the flagship Chandra X-ray observatory, NASA has released 25 never-before-seen images of iconic astronomical objects.

NASA launched the Chandra X-ray Observatory 25 years ago this week, ... a craft that would have prospected for water ice on the Moon, after spending some $450 million to build it.

For the 25th anniversary of the Chandra X-ray Observatory, NASA produced ghostly time-lapse videos of two centuries-old stellar eruptions.

New observations from NASA's Chandra X-ray Observatory and other telescopes have captured a rare cosmic event: Two galaxy clusters have collided and are now poised to head back for another swipe ...

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.

STUNNING: NASA released 25 never-before-seen images - including the 'Pillars of Creation,' Cat's Paw Nebula and more - to celebrate the 25th anniversary of its Chandra X-ray Observatory.