The video begins with a view of the Earth and the moon in space, with a red line indicating the trajectory of an object. As the video progresses, the red line moves along the trajectory, and green lines appear, representing the gravitational pull of the Earth and the moon. The red line curves and bends, demonstrating the object's path as it is influenced by the gravitational forces. The video ends with the red line continuing along its trajectory, illustrating the object's movement through space.