mrt 082013
Anne's Picture of the Day: The Blue Planetary Nebula

March 8, 2013 The Blue Planetary, a planetary nebula in Centaurus Image Credit: ESA/Hubble and NASA The Blue Planetary Nebula (NGC 3918) is a bright planetary nebula of some 0.3 light-year across that lies about 4,900 light-years from Earth in the constellation of Centaurus. It is approaching us at roughly 17 kilometers per second, while [continue reading]