... Zooming in on the First Stars . ... No known stars appear to be composed of truly primordial gas -- all of the stars around us have too many heavy elements. Our own Sun is thought to be a third generation star, with many second-generation stars seen in globular clusters. APOD: 2003 June 9 Ш The Pencil Nebula Supernova Shockwave . ... Rhea: Saturn's Second Largest Moon . ... Anticipating the celestial shadow play of a solar eclipse, sky gazers across Germany watched the Sun rise on May 31. ...