jan 262013
Anne's Picture of the Day: Galaxy Cluster Abell 2218

January 26, 2013 Abell 2218, a galaxy cluster in Draco Image Credit: NASA, ESA, and Johan Richard (Caltech, USA) Acknowledgement: Davide de Martin & James Long (ESA/Hubble) Abell 2218 is a rich galaxy cluster that contains more than 10,000 galaxies, located some 2.35 billion light-years away (redshift 0.18) in the northern constellation of Draco. Redshift [continue reading]