The Orion Nebula, an interstellar cloud in which star systems and possibly planets are forming.
Close-up of the Orion Nebula obtained with HST, revealing what seem to be disks of dust and gas surrounding newly formed stars. These protoplanetary disks span about 0.14 light years and are probably similar to the Solar Nebula.
Left: Old stellar cluster. Right: Young cluster displaying luminous hot stars.
heavy elements are ejected out to space to be reused
Onion-skin structure with iron at the center (not to scale)
SN 1987A in the Large Magellanic Cloud
The Crab nebula: the remnant of a SN recorded in A.D. 1054
Eintein's cross (multiple images of one quasar)
(Note: Several images come from http://zebu.uoregon.edu/~js/ast122/)