The subject of this image could easily be confused for a nebula, when in fact, you are looking at the Hydra A galaxy cluster, which lurks 840 million light-yeas from Earth in the constellation of Hydra.
Its resemblance to a nebula is a consequence of the wavelength at which we are viewing it. This composite was put together for the purpose of highlighting the region's emission. Radio emission is seen in pink from the Very Large Array. X-ray data from Chandra is marked in blue. Optical data comes from the Canada- France-Hawaii telescope and the Digitized Sky Survey.