The video explains the concept of orbits, focusing on why celestial objects orbit rather than moving in a straight line or being pulled into the object they orbit. It discusses Newton's first law, the gravitational pull of larger objects, and how these forces result in a stable orbit. The video also covers how velocity and acceleration are related to orbits, emphasizing that a change in direction means acceleration. Finally, it explores the relationship between the size of an object's orbit and its speed, noting that a smaller orbit requires a faster speed to maintain stability.

What happens to the moon's velocity when it changes direction while orbiting?

Describe the relationship between the size of an object's orbit and its speed.