nov 252013
Anne's Image of the Day: Open Cluster Messier 103

November 25, 2013 Messier 103, an open cluster in Cassiopeia Image Credit: Hillary Mathis, N.A.Sharp/NOAO/AURA/NSF Messier 103 (also known as NGC 581) is a young, about 25 million years old, open cluster of about 15 light-years across, located 8,000 to 9,500 light-years away from the Earth in the northern constellation of Cassiopeia (the Seated Queen). [continue reading]