|This two-clocks-illustration shows the pattern of how two atomic clocks would desynchronize and then resynchronize due to a lump of dark matter sweeping through a Global Positioning System or other atomic clock based network. Photo courtesy of Andrei Derevianko, University of Nevada, Reno.|
|How Esa scientists believe Philae has landed on the comet – on its side. Photograph: European Space Agency/Reuters|
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