Dark matter zoom 1 (IMAGE)
Caption
Projected dark matter density map, created using a simulation measuring 2.4 billion light years on each side. . The intermediate square (top right) is just under a million light years across. The smallest square (bottom left) is the deepest zoom: it is only 783 light years across, equivalent to 500 times the size of the solar system. In the intermediate square(top right) the largest dark matter haloes have a mass similar to that of a rich galaxy cluster (a million trillion times the mass of the Sun). In the smallest square (bottom right) the smallest clearly visible haloes have a mass comparable to that of the Earth (0.000003 the mass of the Sun).
Credit
Dr Sownak Bose, Center for Astrophysics, Harvard University
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