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Messier 13: Difference between revisions
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[[Messier 13]] (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of [[Hercules]].<ref>[http://en.wikipedia.org/wiki/Messier_13 Messier 13]</ref> | [[Messier 13]] (M13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of [[Hercules]].<ref>[http://en.wikipedia.org/wiki/Messier_13 Messier 13]</ref> | ||
M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is ared giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is 25,100 light-years away from Earth. | |||
==Arecibo message== | ==Arecibo message== | ||