Can an asteroid hit Earth?
It is possible that an asteroid may hit Earth one day, but the chances of this happening are very small. Most asteroids are located in the asteroid belt and stay between the orbits of Mars and Jupiter which is very far from us. However, some are in orbits which can take them closer to Earth. Astronomers are always watching the sky and some of them specialize in tracking these asteroids. If an asteroid was heading for Earth, chances are that we would know about it years ahead of time and would have a lot of time to plan a defense.