How do satellite intercept missions work in space defense?

Satellite intercept missions are like a cosmic game of tag where one spaceship chases down and stops a bad satellite from causing trouble using speed or physical bumps. Imagine you have two toy cars on a table. One car is yours, and the other is the "bad guy" drifting toward your toys. You gently push your car so it catches up to the bad guy, maybe hitting it softly or just docking with it to steer it away.

First, satellites in space move very fast, even if they look like they are floating still from Earth. They are zooming around our planet at about 17,500 miles per hour. To catch them, the defense satellite has to match their speed and direction perfectly. It is like riding a bicycle next to another rider so you can hand them a water bottle without crashing. The satellites use tiny thrusters, which are small jet engines that puff out gas, to steer themselves into the right path.

Once close, there are two main ways to stop the bad satellite. Some missions use hardkill methods, where a special projectile hits the target with enough force to break it apart or destroy its sensors. This is like throwing a tennis ball at a balloon to pop it. Other missions use softkill, such as a robotic arm that grabs the satellite and holds it gently, much like you might pick up your little brother to stop him from running into traffic. The goal is not always to blow things up but simply to make the threat safe and harmless again.