Why don’t people fall off the Earth?

               Gravity is the force that holds us on the Earth. It is also the force that keeps the Earth from flying off into space as it orbits the Sun. The larger the mass of any object the more it attracts other objects with the force of its gravity. The Sun’s gravity helps to pull the Earth’s oceans, causing tides.

               Astronauts in space experience zero gravity, because they orbit the Earth so quickly that the effects of gravity are neutralized. The Moon is much smaller than the Earth, and so it produces less gravity. Astronauts on the Moon weighed only one-sixth of their normal weight on the Earth, even though their body mass remained the same.

Picture credit: google