Dodging rockets

NASA raised the International Space Station’s orbit by 1.5 kilometres last week to avoid a spent Pegasus rocket, which was being monitored by the US Space Command. NASA predicts it will have to move the station twice a year to evade space debris. This was the first successful manoeuvre. In June an effort to move away from a spent Russian rocket stage failed, leaving the station adrift temporarily. However, it escaped damage (New Scientist, 26 June,
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