Gravitational motion refers to the movement of objects due to the force of gravity, which is the attraction between two masses. This force is what keeps planets like Earth in orbit around the Sun and causes objects to fall towards the ground when dropped. The strength of gravity depends on the masses of the objects and the distance between them. In space, gravitational motion can lead to various phenomena, such as the orbits of moons around planets and the formation of galaxies. Isaac Newton first described the laws of gravitational motion in the 17th century, laying the groundwork for our understanding of how gravity influences the movement of celestial bodies.