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

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  • mahtezcatpoc
    http://apod.nasa.gov/apod/ap120701.html What causes the surrounding shells in peculiar galaxy Cen A? In 2002 a fascinating image of peculiar galaxy Centaurus
    Message 1 of 139 , Jul 3, 2012
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      http://apod.nasa.gov/apod/ap120701.html


      "What causes the surrounding shells in peculiar galaxy Cen A? In 2002 a fascinating image of peculiar galaxy Centaurus A was released, processed to highlight a faint blue arc indicating an ongoing collision with a smaller galaxy. Another interesting feature of Cen A, however, is the surrounding system of shells, better visible here in this recently released wider pan from the four meter Blanco telescope at Cerro Tololo Inter-American Observatory. Faint shells around galaxies are not unusual and considered by themselves as evidence of a previous galaxy merger, analogous to water ripples on a pond. An unexpected attribute of these shells is the abundance of gas, which should become separated from existing stars during the collision."



      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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