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In 2004, a newly discovered a 250-yard wide asteroid named Apophis, made a splash in the media when it was predicted that it had a 2.5 percent chance of striking Earth in 2029. New instruments and calculations, which are sixty times better than the ones used previously, show that there's virtually no chance of hitting Earth in 2029. And just last month it was determined that there's no chance of it hitting Earth in 2036 either. Apophis is circled above.
One of the biggest asteroid threats found so far is from 500-yard wide "1999 RQ36." It's estimated that it has a 1-in-2,400 chance of impacting Earth in the late 22nd century. NASA plans to send the OSIRIS-REx to land on the asteroid and take samples for further study. OSIRIS-REx is expected to launch in 2016, arrive in 2018, and work until 2021 before returning back to Earth with soil samples.