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The rocket's "exact entry point into the Earth's atmosphere" can't be pinpointed until within hours of reentry, Howard said, but the 18th Space Control Squadron will provide daily updates on the rocket's location through the Space Track website. The rocket was used by the Chinese to launch part of their space station last week. While most space debris objects burn up in the atmosphere, the rocket's size -- 22 tons -- has prompted concern that large parts could reenter and cause damage if they hit inhabited areas.
But Jonathan McDowell, an astrophysicist at the Astrophysics Center at Harvard University, told CNN that the situation is "not the end of days."