In February 1991, after nine years in orbit, the Russian space station Salyut-7 became one of the largest human-made objects to reenter Earth’s atmosphere. Because of its low orbit, Soviet engineers attempted to guide its descent into the Atlantic Ocean, but their efforts failed. The 88,000-pound station shed metal fragments over cities in Argentina, where unharmed residents observed glowing trails in the sky, according to the Aerospace Corporation.
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