mrt 252013
Anne's Picture of the Day: The Cocoon Nebula

March 25, 2013 The Cocoon Nebula, a reflection/emission nebula in Cygnus Image Credit & Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona ( The Cocoon Nebula (designated IC 5146 or Sh2-125) is a reflection/emission nebula of about 15 light-years across that surrounds the young, open star cluster Collinder 470. It lies some 4,000 light-years away in [continue reading]