Scientists are saying not to worry about two giant asteroids that are hurtling towards Earth. The European Space Agency says an asteroid over a mile wide will be zipping by the Earth this afternoon at a relatively close four-million miles away. It poses no threat, but they say it's the closest flyby on record of an asteroid that size. On Saturday, another huge asteroid will zip past our planet. The recently-discovered asteroid is a lot smaller at about 800 feet wide, but will come a lot closer at around 180-thousand miles from Earth. Scientists say there's no risk of it hitting us, but at the same time noted that if it did, it would cause "considerable damage."