jan 252013
Anne's Picture of the Day: The Cave Nebula

January 25, 2013 The Cave Nebula, an emission nebula in Cepheus Image Credit & Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona (http://www.caelumobservatory.com/index.html) The Cave Nebula (Sharpless 155 or Sh2-155) is a dim and very diffuse bright emission nebula surrounded by dust. It has a radius of about 35 light-years, and is located some 2400 light-years [continue reading]