aug 082013
Anne's Image of the Day: Thor's Helmet

August 8, 2013 Thor’s Helmet, an emission nebula in Canis Major Image Credit & Copyright: Robert Gendler ( Thor’s Helmet (designated NGC 2359 and Sh2-298) is an emission nebula of about 30 light-years across, located approximately 15,000 light-years away from Earth in the constellation of Canis Major (the Great Dog), about 8o northeast of Sirius. [continue reading]