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Space science image of the week: Swarms of black holes and clusters of galaxies in the X-ray sky
via ESA Space Science
http://www.esa.int/spaceinimages/Images/2014/04/An_X-ray_view_of_the_COSMOS_field
Space science image of the week: Swarms of black holes and clusters of galaxies in the X-ray sky
via ESA Space Science
http://www.esa.int/spaceinimages/Images/2014/04/An_X-ray_view_of_the_COSMOS_field
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