An asteroid nearly a mile wide will hurtle past Earth on Sunday July 22.The asteroid is estimated to be 2,000 to 4,500ft wide, and qualifies as a 'near Earth object'.NEA (near-Earth asteroid) 2002 AM31 is described as 'the size of a city block'.Astronomers say not to panic - it will pass through space 14 times further from Earth than the Moon.

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