In this undated photo provided by the European Space Agency, ESA, analysts at work in the space debris facility located at ESA's ESOC mission control centre, Darmstadt, Germany. Decades' worth of man-made junk is cluttering up Earth's orbit, posing a threat to spaceflight and the satellites we rely on for weather reports, air travel and global communications. More than 750,000 fragments larger than a centimeter are already thought to orbit Earth, and each one could badly damage or even destroy a satellite. (Roberto Palmari/ESA via AP)
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