U.S. military expands efforts to track satellites

The U.S. military said last week that it is tracking 800 maneuverable satellites on a daily basis for possible collisions and expects to add 500 more non-maneuvering satellites by year's end. The U.S. Air Force began upgrading its ability to predict possible collisions in space after a defunct Russian military communications satellite and a commercial U.S. satellite owned by Iridium collided on Feb. 10.

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