A 100ft-wide asteroid, first spotted when it flew by Earth two years ago, is set to make its return – and this time it could get incredibly close.
The whale-sized space rock may skim past Earth at just 11,000 miles (17,000 km), which is around 21 times closer to Earth than the moon.
But Nasa admits this estimate may be widely inaccurate, and the asteroid may also pass Earth as far out as 9 million miles (14 million km).
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