Science Fair Project Encyclopedia
Ptolemy Cluster
(Redirected from Open Cluster M7)
The Ptolemy Cluster (also known as Ptolemy's Cluster, the Scorpion's Tail, Open Cluster M7, Messier Object 7, Messier 7, M7, or NGC 6475) is an open cluster in the Scorpius constellation. It was known to Ptolemy by 130 AD. M7 is a large and brilliant group, easily detected with the naked eye.
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10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details


