Astronomers have discovered one type of growing supermassive black hole masquerading as another.

By detecting an X-ray flare from a very young star using NASA's Chandra X-ray Observatory, researchers have reset the timeline for when stars like the Sun start blasting high-energy radiation into space.

By combining data from telescopes with supercomputer simulations and virtual reality (or "VR"), a new visualization allows you to experience 500 years of cosmic evolution around the supermassive black hole at the center of the Milky Way.

Astronomers have caught a black hole hurling hot material into space at close to the speed of light.

Several hundred million years ago, two galaxy clusters collided and then passed through each other. This mighty event released a flood of hot gas from each galaxy cluster that formed an unusual bridge between the two objects.

Astronomers may have discovered a new kind of survival story: a star that had a brush with a giant black hole and lived to tell the tale through exclamations of X-rays.

One of the fundamental ideas of cosmology is that everything looks the same in all directions if you look over large enough distances. A new study using data from NASA's Chandra X-ray Observatory and ESA's XMM-Newton is challenging that basic notion.

Astronomers using NASA's Chandra X-ray Observatory have made one of the first experimental tests of string theory, a set of models intended to tie together all known forces, particles, and interactions.

Astronomers have discovered the biggest explosion seen in the Universe in a galaxy cluster 390 million light years away.

Astronomers have spotted a double star system is flip-flopping between two alter egos using NASA's Chandra X-ray Observatory and other telescopes.