There are millions of asteroids floating in our Solar System. Every year thousands of meteorites weighing about a pound fall on Earth. Usually we don’t see them, because they land in uninhabited forests or the ocean. However, in 2004 scientists discovered a really dangerous asteroid in space weighing more than 20-million-tons or 40-billion-pounds. The first observations show it has a 2.7% of chance of hitting us in 2029. If an asteroid this big hit the Earth, it would cause major devastation ove