Rare event: a large asteroid nicknamed "City Killer" will graze the Earth and the Moon this Saturday archyde.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from archyde.com Daily Mail and Mail on Sunday newspapers.
An asteroid this size coming so close to Earth is a once-in-a-decade event, although a collision with the planet is not expected. The journey offers astronomers a prime opportunity to study a space rock.