1. Rotation: This is the spinning of an object around its own axis. For example, the Earth rotates on its axis, which is why we have day and night.

2. Revolution: This is the movement of one object around another object. For example, the Earth revolves around the Sun, which is why we have a year.

3. Translation: This is the movement of an object from one point in space to another. For example, a spaceship might translate from Earth to Mars.

These three motions are fundamental to understanding the movement of celestial bodies in space.