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NGC 6522
NGC 6522 is a globular cluster in the constellation Sagittarius. It was discovered by William Herschel on June 24, 1784. It is centered in a region of the sky known as Baade's Window.〔 NGC 6522 is possibly the oldest star cluster in the Milky Way,〔("VLT-FLAMES Analysis of 8 giants in the Bulge Metal-poor Globular Cluster NGC 6522: Oldest Cluster in the Galaxy?" ) by B. Barbuy ''et al.'', 2009〕 with an age of more than 12 Gigayears.〔("The universe's first stars were whirling dervishes" ), ''New Scientist'' by David Shiga, 30 April 2011, p. 20. ("Imprints of fast-rotating massive stars in the Galactic Bulge" ) by Cristina Chiappini ''et al.'', ''Nature'' 472, pp. 454–457 (28 April 2011).〕 ==References==
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