May 07, 2008 The Orion Nebula Star Cluster Most stars form in clusters, sometimes with ten thousand or more stars packed into a volume smaller than a few light-years in radius.  Read More...

April 30, 2008 Cold but Luminous Over the past two decades astronomers have come to realize that many galaxies are fabulously luminous -- some are more than a thousand times brighter than our Milky Way.  Read More...

April 23, 2008 Understanding Ionized Gas Here on earth we are aware of ultraviolet (UV) radiation in space because of the dangers it poses to our health; the atmosphere is our shield against its damaging effects.   Read More...