chandra x-ray observatory

A collision between two neutron stars is emitting mysterious X-rays—and astronomers are getting closer to pinning down the source.

Four new images of supernova remnants celebrate the telescope's 15 years of awesome discoveries

Because who doesn't like a pretty space pic?

A nearby galaxy that looks like a smiley face harbors a dark secret: It has twin supermassive black holes, not...

A mystery is unfolding out there in the cosmos, and NASA’s Swift, Hubble Space Telescope, and Chandra X-Ray Observatory are...

The cores of neutron stars are the densest observable known matter in the universe, so dense that a single teaspoon...