Chandra

Astronomers have discovered an immense surge of energy coming from a cosmic particle accelerator located about 2 billion light years from Earth.

Huge numbers of supermassive black holes are visible in a stunning new photo that astronomers said is the deepest X-ray image of the sky ever captured.

A decades-old galactic mystery has just been solved — new research has revealed why a distant galaxy has brightened and dimmed like a flickering candle flame over the last 30 years.

Just in time for the Olympic Games in Rio, NASA has unveiled a new project called "AstrOlympics" that compares the feats of the athletes to amazing things found in space.

A surprisingly light supermassive black hole may have shed pounds thanks to a galaxy-merger crash diet, astronomers say.