Gravity is the force that connects every object - planet, the Sun, moons, asteriods, comets - to every other object. The Earth is constantly being tugged by all the other bodies in the solar system. Except for the Sun and the Moon, most bodies are either too small or too far away to have a noticable effect. We are bound to revolve around the Sun due to the Sun's gravitational pull on us. The Moon affects our tides and the rate at which we spin. Slowly over the centuries the Moon is acting like a brake to slow down our days. The dinosaurs had 18 hour days! We affect other bodies too. We pull other small objects towards us so we occasionally have meteors crash into us.