Other asteroids have been known to make such close passes, but it is rare for two to be spotted zooming in at the same time. Called 2010 RF12, it is estimated to be 20 to 46 feet wide (6 to 14 meters) and was expected to pass within 49,000 miles (79,000 km) a few hours later at 5:12 pm EDT (2112 GMT), NASA asteroid trackers said. On average, the moon is about roughly 238,900 miles (384,402 km) from Earth. It is estimated to be about 33 to 65 feet wide (10 to 20 meters) and passed within 154,000 miles (248,000 km) of the planet. The larger of the two space rocks, asteroid 2010 RX30, flew by Earth first at about 5:51 a.m.
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