 Well, you might have noticed it. I don't know. An asteroid whizzed past the Earth this weekend. This space rock is called 2024 MK. It made its closest approach to Earth this morning, passing by at about three-quarters of the distance from Earth to the Moon. Smaller objects shoot past Earth all the time, but asteroids this size fly by about once every 25 years or so. If you want to see it, you'll need a telescope. 2024 MK is between 393 feet tall.