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[i]Astronomers investigated near-Earth asteroid 1950 DA, which is about four-fifths of a mile wide (1.3 kilometers). This asteroid currently has one of the greatest chances of colliding with Earth of any known asteroid, with about a 1 in 4,000 chance of impacting the Earth in the year 2880. ...unexpectedly, the scientists found 1950 DA is a porous rubble pile, about half of which is empty space.[/i]
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