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It's notable when an asteroid flies past Earth closer than the Moon. Today, April 6th, two asteroids will do this. Newly-discovered space rocks 2011 GW9 and 2011 GP28 will zip through the Earth-Moon system at Earth-distances of 77,000 km and 192,000 km, respectively.

Both are ten-meter class asteroids two to three times smaller than the Tunguska impactor of 1908. There is no danger of a collision.

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