Astronomy Picture of the Day . GL 229B: An Elusive Brown Dwarf? ... A leading candidate is a type of dim, low mass star called a "brown dwarf" star. ... In the center of the above photograph lies a star with one of the hottest surface temperatures yet confirmed. ... Releasing Compton . ... Too Close to a Black Hole . ... A Star Where Photons Orbit . ... The star pictured is actually more compact that any known except a black hole, so it is only hypothetical. ... Saturn's Cleanest Moon: Enceladus . ...