Astronomers have found an extraordinary galaxy cluster -- one of the largest objects in the Universe -- that is breaking several important cosmic records.

Over fifty years ago, a supernova was discovered in M83, a spiral galaxy about 15 million light years from Earth.

A pulsar found racing away from a supernova remnant about 30,000 light years from Earth.

Astronomers think that just about every galaxy has a giant black hole at its center.

At the center of a galaxy some 4 billion light years from Earth, something extraordinary is happening. This galaxy, known as CID-42, contains a giant black hole.

Why are some supernovas much more powerful than others? Astronomers are still trying to figure that out, but one new discovery may help answer the question.

Since the 1980s, astronomers have known about a mysterious class of objects that they call "ultraluminous X-ray sources," or ULXs.

Using a combination of powerful observatories in space and on the ground, astronomers have discovered a violent collision between two galaxy clusters.

When we look up on a dark night, we see a sky filled with stars. The light from a star, like the light from a flashlight or a lightning bug, is one form of electromagnetic radiation.

Over three hundred years ago, a very large star ran out of fuel and collapsed. This event created an explosion, known as a supernova, which then produced an expanding field of debris.