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NASA Astronomy Picture of the Day (April 17, 2012)

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  • mahtezcatpoc
    http://apod.nasa.gov/apod/ap120417.html Antares is a huge star. In a class called red supergiant, Antares is about 850 times the diameter of our own Sun, 15
    Message 1 of 139 , Apr 19, 2012
      http://apod.nasa.gov/apod/ap120417.html

      "Antares is a huge star. In a class called red supergiant, Antares is about 850 times the diameter of our own Sun, 15 times more massive, and 10,000 times brighter. Antares is the brightest star in the constellation of Scorpius and one of the brighter stars in all the night sky. Located about 550 light years away, Antares is seen on the left surrounded by a yellowish nebula of gas which it has itself expelled. Radiation from Antares' blue stellar companion helps cause the nebular gas to glow. Far behind Antares, to the lower right in the above image, is the globular star cloud M4, while the bright star on the far right is Al Niyat."


      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
        http://apod.nasa.gov/apod/ap121206.html

        The bright globular cluster 47 Tucanae (aka NGC 104).


        Mark A. Holmes
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