As the old saying goes, life can move pretty fast, but this is especially true in space, where the difference in orbital velocities between two different objects can literally be faster than a speeding bullet. Last month, British astronaut Tim Peake posted a photograph of a 7 mm (1/4 inch) impact chip in one of the International Space Station's Cupola windows, suspected to have been caused by a miniscule piece of debris no bigger than a few thousandths of a millimeter across.
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