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Thread: A hole in the sky

  1. #1 A hole in the sky 
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    What used to be considered a hole in the sky is now known to astronomers as a dark molecular cloud. Here, a high concentration of dust and molecular gas absorb practically all the visible light emitted from background stars. The eerily dark surroundings help make the interiors of molecular clouds some of the coldest and most isolated places in the universe.


    http://apod.nasa.gov/apod/ap090623.html


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  3. #2  
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    Cool picture. Dark nebulae are always so creepy looking.


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    This object one of the most extensively investigated dark clouds. It has been known already for decades and is now considered as the template for all starless clouds that will some day produce new stars. It is even known to be pulsating. Here are a few scientific publications on this object.

    http://adsabs.harvard.edu/abs/2001Msngr.106...40N
    http://arxiv.org/abs/astro-ph/0211507
    http://arxiv.org/abs/astro-ph/0604056
    http://arxiv.org/abs/0809.1457
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  5. #4  
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    Quote Originally Posted by Feifer
    Cool picture. Dark nebulae are always so creepy looking.

    There was an episode of Star Trek : Voyager where such a cloud is in their path home and is too big to go around so they spend months travelling through it, unable to see any of the outside universe from inside it (leaving them all rather depressed, etc).
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