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Black hole shines a light on dark galaxies | Ars Technica
Black hole shines a light on dark galaxies | Ars Technica
http://arstechnica.com/science/2012/...dark-galaxies/ http://cdn.arstechnica.net/wp-conten...es-640x680.jpg Ultraviolet light from a quasar (in red circle) causes hydrogen gas in dark galaxies (blue circles) to fluoresce. |
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