An artists impression of a typical young galaxy, teeming with hot, new-born stars and exploding supernovas. The supernovas are seen as white flashes of light. NASAs Galaxy Evolution Explorer spotted three-dozen young galaxies like the one shown here in our corner of the universe. It was able to see them with the help of its highly sensitive ultraviolet detectors. Because new-born stars radiate ultraviolet light, young galaxies light up brilliantly when viewed in ultraviolet wavelengths.