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Mark H
Messier Monday: The Great Globular Cluster in Hercules, M13 - http://scienceblogs.com/startsw...
Messier Monday: The Great Globular Cluster in Hercules, M13
Messier Monday: The Great Globular Cluster in Hercules, M13
Messier Monday: The Great Globular Cluster in Hercules, M13
"To usher in 2013, I’d like to take a look at Messier 13, the Great Globular Cluster in Hercules, which is visible to northern skywatchers both immediately after sunset and, perhaps most spectacularly, again from after about 2 AM until sunrise. To find it at this later time, look above the horizon to the northeast and find the constellation of Hercules near Vega, one of the brightest stars in the sky." - Mark H from Bookmarklet
"Like many of our galaxy’s globular clusters, Messier 13 is old (with an age of around 11.7 billion years), has hundreds of thousands of stars (about 300,000, with a total mass of about half-a-million Suns), and has an intermediate concentration of stars towards the center (it’s class V on a scale of I, the most dense, to XII, the least)." - Mark H