An Asteroid bigger than the Empire State Building in New York could one day smash into earth, scientists have warned.
Asteroid 2015 BN509 whizzed by earth at 44,000 mph last week at just 14 times the distance between the earth and the moon.
NASA has said that at one point on its journey it could return on a collision path with earth.
The video footage below was captured by the Arecibo observatory who filmed it tumbling through space at thousands of miles per hour.
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