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NASA Astronomy Picture of the Day (April 29, 2012)

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  • mahtezcatpoc
    http://apod.nasa.gov/apod/ap120429.html On planet Gliese 876d, sunrises might be dangerous. Although nobody really knows what conditions are like on this
    Message 1 of 139 , May 13, 2012
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      http://apod.nasa.gov/apod/ap120429.html

      "On planet Gliese 876d, sunrises might be dangerous. Although nobody really knows what conditions are like on this close-in planet orbiting variable red dwarf star Gliese 876, the above artistic illustration gives one impression. With an orbit well inside Mercury and a mass several times that of Earth, Gliese 876d might rotate so slowly that dramatic differences exist between night and day. Gliese 876d is imagined above showing significant volcanism, possibly caused by gravitational tides flexing and internally heating the planet, and possibly more volatile during the day. The rising red dwarf star shows expected stellar magnetic activity which includes dramatic and violent prominences. In the sky above, a hypothetical moon has its thin atmosphere blown away by the red dwarf's stellar wind. Gliese 876d excites the imagination partly because it is one of the few extrasolar planets known to be in or near to the habitable zone of its parent star."


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

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


        Mark A. Holmes
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