According to Nasa, a massive asteroid bigger than the size of the Eiffel Tower is expected to break into the orbit of Earth in over a week. The massive 1,082-foot space rock is on its way to earth and should pass the earth by December 11. Asteroid 4660 Nereus, which is well over 492 feet long and is expected to come within 4.6 million miles of Earth, has caught Nasa's attention.