The Apollo-class asteroid, called 3361 Orpheus, is 984 feet wide and is travelling at around 18,000 miles per hour. NASA will be keeping a close eye on the huge space rock, which has made it onto the space agency's 'Close Approach' list. But there's no need to panic just yet – the asteroid will pass through a distance of 3.5 million miles from our home planet. Anything that passes within 120 million miles is considered a Near Earth Object (NEO), a term used to describe "comets and asteroids that have been nudged by the gravitational attraction of nearby planets into...