Here's why:
* Centripetal force is the force that keeps an object moving in a circular path. It always acts perpendicular to the object's velocity and towards the center of the circle.
* A satellite in uniform circular motion means it's moving at a constant speed in a circular path. The only way this can happen is if there's a force constantly pulling the satellite towards the center of the circle.
* Gravity is the force that acts as the centripetal force for satellites in orbit around Earth. Earth's gravity pulls the satellite towards its center, keeping it in its circular path.
In summary: The centripetal force acting on a satellite is the force of gravity, and it always points directly towards the center of the Earth.
