The galaxy, known as M60-UCD1, is located about 54 million light years from Earth.

Galaxy clusters are the largest structures in the Universe held together by gravity.

It took some pretty impressive technology to get these pictures, which wasn't available to our ancient ancestors.

Pictures of space are often gorgeous. But one of the most exciting things about them is that, very often, they show us things that are invisible to the human eye.

Scientists have long known that the giant black hole at the center of the Milky Way is a particularly poor eater.

HD 189733 is an enormous gas giant, over 100 times bigger than Earth.

The hot gas cloud is likely caused by a collision between a dwarf galaxy and a much larger galaxy called NGC 1232.

NASA's Chandra Sees Eclipsing Planet in X-rays for First Time

Stars like the Sun can become remarkably photogenic at the end of their life.

Astronomers estimate that a star explodes as a supernova in our Galaxy, on average, about twice per century.