asteroid the size of one which wreaked havoc in Russia is set to make a close approach with Earth on September 1.Labelled asteroid 2011 ES4 by NASA, it measures 22m to 49m in diameter and has been classed as a Near Earth Object (NEO).It is expected to pass closest to the Earth around 5.12pm.Astronomer Dr Tony Phillips wrote on spaceweather.com: "On Sept 1, asteroid 2011 ES4 will fly through the Earth-Moon system only 72,000 miles from Earth – close, but there is no danger of a collision."It is roughly the same size of the Chelyabinsk meteor, which entered Earth’s atmosphere above Russia in February 2013.The meteor triggered a shock wave the broke windows in six Russian cities.
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