The truth about the 'Christmas asteroid'

A giant asteroid will pass our planet at about 15:17 on December 20, according to NASA.

The space rock is estimated to measure around 240 - 540 metres in diameter.

During the passing, the asteroid will be around 3.6 million miles away from Earth. This might sound far, it's classed as a 'close approach' by NASA.

Thankfully, it's very unlikely that the asteroid will impact Earth during the passing.