A large orbiting laboratory circling Earth roughly every…

A large orbiting laboratory circling Earth roughly every ninety minutes at an altitude of about four hundred kilometres. Its first module, Zarya, was launched in 1998, and it has been continuously occupied by rotating crews since November 2000. Built and operated by agencies from the United States, Russia, Europe, Japan and Canada, it is the largest structure humans have assembled beyond the atmosphere, roughly the size of a football pitch.

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