So MUCH color. Beautiful to behold. We are blessed to see this majesty. Cassiopeia A (Cas A) is a supernova remnant in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz.
NGC 6188 and NGC 6164 Fantastic shapes lurk in clouds of glowing hydrogen gas in NGC about light-years away. The emission nebula is found near the edge of a large molecular cloud unseen at visible wavelengths, in the southern constellation Ara.
The Seahorse of the Large Magellanic Cloud Credit: NASA, ESA, and M. Livio (STScI) Explanation: It may look like a grazing seahorse, but the dark object toward the image right is actually a pillar of smoky dust about 20 light years long.