Cassiopeai A. Composite image combined infra red data from Spitzer in red, visible wavelength data from Hubble in yellow and x-ray data from Chandra in green and blue! From NASA Website pinned from artstechnica.com
This mosaic of the Andromeda spiral galaxy highlights explosive stars in its interior, and cooler, dusty stars forming in its many rings. This is a combination of observations from the Herschel Space Observatory and the XMM-Newton telescope.