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Actually, gravity does exist on airplanes, which is why people can walk easily on a plane.  Gravity is what holds you in your seat and to the floor when you walk around. Try dropping something the next time you’re on an airplane.  It will fall straight down. Gravity works on a larger scale than we might imagine. Gravity exists everywhere in the universe. Gravity holds the Moon and the International Space Station in orbit around the Earth, and it holds the Earth in orbit around the Sun.