... Irregular Galaxy Sextans A . ... But small irregular galaxies form stars too, like this lovely, gumdrop-shaped galaxy, Sextans A. Mars: A Sheer Close Up . ... As the Mars Global Surveyor spacecraft maneuvers toward its final mapping orbit, its cameras have been producing some sharp views of Mars. ... The Annotated Galactic Center . ... Most are visible with only binoculars. ... The inset frame of Jupiter's most active moon was taken by the robot spacecraft Galileo in April. ... Surveyor Slides . ...