The asteroid in question, dubbed 2010 WC9, was first discovered in 2010 by astronomers using the Catalina Sky Survey in Arizona.

But shortly after it was discovered experts lost track of the huge space rock.

2010 WC9 was spotted again earlier this month and scientists now say that it is heading towards Earth and will just miss us.

The asteroid will fly by Earth at a distance of 126,000 miles – just half the distance between the Earth and the Moon – at 11.05PM on May 15.