... The actual supernova occurred back when dinosaurs roamed the Earth, but images of the spectacular event began arriving last year. ... Light Pillars over Alaska . ... Massive stars lie within NGC 6357, an expansive emission nebula complex some 6,500 light-years away toward the tail of the constellation Scorpius. ... Dwarf Planet Ceres . ... Ceres is seen here in approximately true color, based on image data from the Dawn spacecraft recorded on May 4, 2015. ... Comet 67P from Spacecraft Rosetta . ...