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Messier Monday: A Cluster That Stands Out From The Galaxy, M23, by Ethan Siegel, Starts With A Bang!
Cosmotography- CCD images of the heavens.
Archives: Gallery Images
Messier 65 - Alchetron, The Free Social Encyclopedia
Hidden Universe
Twinkle Toes Engineering
Rick's Astronomy Blog
APOD: 2004 June 16 - Elliptical Galaxy M87
DEEP SPACE PICTURES
Globular cluster - Wikipedia