Close asteroid will be zipping past the Earth on Christmas Day that is longer than two full-length football fields. It is currently being monitored by NASA. It has been labeled Asteroid 501647 (designated 2014 SD224). It is included on NASA's "close approach" list. Its length could reach a maximum of 689 feet in width. It has been predicted to approach as close as 1.9 million miles from our planet. A distance of almost 2 million miles may look like a good distance, but about space, this is very close. This is because rapidly moving objects in space that approach approximately 4.65 million miles away already counts as a potentially dangerous distance. This standard has been set by space organizations that are especially cautious and conservative.