A peanut-shaped asteroid larger than the Empire State Building could one day hit Earth, Nasa has warned.
The space rock, known as 2015 BN509, came close to Earth last week when it flew past at 44,000mph (70,500km).
At it closest approach, it came just 14 times the distance between Earth and the moon.
Nasa has labelled the asteroid, which about 200 meters (660ft) wide by 400 meters (1,310ft) long, as ‘potentially hazardous’.
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