Okay kiddo, so you know how we live on planet Earth and we can see all the things around us like trees and houses and cars and people? Well, in space there are lots of other planets too but they are very far away and we can't see them with our regular eyes.
That's where a planetary scanner comes in! It's like a special tool that helps us see other planets and learn more about them. It works by sending out special signals or rays that bounce off the planet and come back to the scanner.
The scanner then takes those signals and turns them into pictures or data that scientists can look at to learn about the planet. For example, they can see if there is water or air on the planet, or what the planet is made of.
Some planetary scanners are on spacecraft that fly really close to the planet and take super clear pictures, while others are on telescopes on Earth that can see really far away planets.
So basically, a planetary scanner helps us see and learn more about other planets that we can't see with our regular eyes. Cool, huh?