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NASA Astronomy Picture of the Day (June 1, 2012)

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  • mahtezcatpoc
    http://apod.nasa.gov/apod/ap120601.html These three bright nebulae are often featured in telescopic tours of the constellation Sagittarius and the crowded
    Message 1 of 139 , Jun 1, 2012
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      "These three bright nebulae are often featured in telescopic tours of the constellation Sagittarius and the crowded starfields of the central Milky Way. In fact, 18th century cosmic tourist Charles Messier cataloged two of them; M8, the large nebula left of center, and colorful M20 on the right. The third, NGC 6559, is above M8, separated from the larger nebula by a dark dust lane. All three are stellar nurseries about five thousand light-years or so distant. The expansive M8, over a hundred light-years across, is also known as the Lagoon Nebula. M20's popular moniker is the Trifid. Glowing hydrogen gas creates the dominant red color of the emission nebulae, with contrasting blue hues, most striking in the Trifid, due to dust reflected starlight. This broad skyscape also includes one of Messier's open star clusters, M21, just above and right of the Trifid."

      We call this cluster of objects Spiculum, one of Vivian Robson's fixed stars.


      Mark A. Holmes
    • mahtezcatpoc
      http://apod.nasa.gov/apod/ap121206.html The bright globular cluster 47 Tucanae (aka NGC 104). Mark A. Holmes
      Message 139 of 139 , Dec 14, 2012
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        The bright globular cluster 47 Tucanae (aka NGC 104).


        Mark A. Holmes
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