Geoffrey.landis writes: "We've been launching satellites for fifty years now, and for the first time, two satellites collided. Tuesday at about noon, an Iridium communications satellite and a defunct Russian satellite collided an altitude of 790 kilometers (491 miles) above northern Siberia, creating a cloud of debris. The international space station does not appear to be threatened by the debris, they said, but it's not yet clear whether it poses a risk to any other military or civilian satellites."
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