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At a Glance A Chinese rocket that became one of the largest pieces of space debris plummeted towards earth today. The rocket’s empty core stage, weighing nearly 18 tons, is the largest piece of space debris to fall uncontrolled back to Earth since 1991.It is the fourth largest piece of space debris to ever fall. Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics, tracked the fall on Twitter. A Chinese rocket became one of the largest pieces of...