Impact crater

When a space rock, like a meteoroid, zooms super fast and hits a planet or moon, it makes a big hole called an impact crater. It's like dropping a heavy ball onto soft sand, but way, way bigger and faster! These craters are usually round and have a raised edge, like a little mountain rim around the hole. They can be tiny, smaller than a coin, or as big as a whole city!

Long, long ago, when the planets were still forming, there were tons of space rocks flying around. This meant lots of crashes and lots of craters! Our Moon and Mercury are covered in them because they don't have wind or rain to smooth them out. Earth has craters too, but our weather and moving land can cover them up or wear them away over millions of years.

Craters are like history books written in the ground! By looking at them, scientists can learn about how many space rocks were flying around in the past. They can even tell how old a planet's surface is. Some craters are so big they can change the way water flows or even affect the weather. They show us that space is a busy place!

Even though Earth tries to hide its craters, we've found about 190 of them! One famous one is Meteor Crater in Arizona, which is about as wide as 20 football fields. Some craters are so old, they are more than 2 billion years old. That's older than dinosaurs! Finding these craters helps us understand our planet's amazing story.