Just Like Ringing Abell
Tuesday, January 31, 2012: Galaxy cluster Abell 1553 contains thousands of galaxies. Clusters of galaxies represent the largest compact structures in the universe. This galaxy cluster contains three large substructures, each centering on a giant elliptical galaxy.
— Tom Chao
Image of the Day Archives
For older Image of the Day pictures, please visit the Image of the Day archives. Pictured: NGC 2467.