Y dwarfs are the coldest star-like bodies known, with temperatures that can be even cooler than the human body. But they aren't actually brown, because, according to astronomers, brown isn't an actual color. There are no "brown photons," and the color we see as brown is actually a desaturated yellow.
This montage of New Horizons images shows Jupiter and its volcanic moon Io, and were taken during the spacecraft's Jupiter flyby in early 2007. The image of Jupiter is an infrared color composite taken by the spacecraft's near-infrared imaging spectrometer, the Linear Etalon Imaging Spectral Array.
Antares and Clouds by Ivan Eder, NASA: Antares is a red supergiant and is about 850 times the diameter of our own Sun, 15 times more massive, and 10,000 times brighter. It is seen on the left surrounded by a nebula of gas which it has itself exploded. To the lower right is M4 and on the far right the bright star is Al Niyat. #Astronomy #Antares # Ivan_Eder #NASA
New Look at a Colossal Cosmic Collision. This beautiful image gives a new look at the interacting galaxies of Stephan's Quintet. Credit: X-ray (NASA/CXC/CfA/E.O'Sullivan); Optical (Canada-France-Hawaii-Telescope/Coelum)