Chandra

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

A once-bright cloud of electrons is being shocked back to life by a collision between two galaxy clusters.

After "sleeping" for 26 years, a black hole's activity lit up astronomical observatories on June 15,and it's still going on today.

The century-old outburst from a classical nova is still going strong and surprising astronomers with its steady temperature.

From a colorful cosmic "flower" to a smiley face in space, don't miss these amazing space images of the week for Feb. 15, 2015.