Okay kiddo, let's talk about something called atmospheric escape. You know how we have air around us that we breathe in and out? Well, planets and other big things in space can also have air around them, which we call an atmosphere.
Now, sometimes things happen that can make this air go away from the planet. Imagine blowing up a balloon and then letting the air out - that's kind of like atmospheric escape for a planet.
One way this can happen is because of something called the solar wind. The sun is blowing out these tiny particles all the time, and they can push on the particles in a planet's atmosphere and make them go away.
Another way atmospheric escape can happen is because of really big explosions, like when a volcano erupts or when a big asteroid hits the planet. Those explosions can send the air and other particles in the atmosphere up into space where they can escape.
Now, why is this important? Well, the atmosphere is what helps keep a planet's climate stable and protects it from dangerous things in space like radiation from the sun. If too much of the atmosphere goes away through atmospheric escape, it can make it harder for life to survive on the planet.
So scientists study atmospheric escape to learn more about how to protect planets and make sure they can support life.