"Due to its proximity to Earth, which is less than 7.5 million km, NASA have declared the asteroid as a potential hazard, but are urging the public not to panic, as they believe there's no immediate threat to our planet." By Rebecca Fisher via extra An asteroid measuring at a whopping 1.2km is currently hurtling towards earth, with experts expecting it to pass close to our planet in the coming week. According to specialists at Nasa's Centre for Near-Earth Object Studies, the asteroid, formally known as 2001 CB21, will slowly approach Earth on March 4 at approximately 8am. The object, which is being classed as 'potentially hazardous' by astronomers, is travelling at about 36,800 miles per hour as it nears Earth. As a point of reference to the true scale of this impending asteroid, experts are claiming the object is four times the size of The Shard in London, which stands at 310 meters high, being the tallest building in Western Europe. Due to its proximity to Earth, which is less than 7