On a fall day, Newton was sitting on a chair in the garden reading, suddenly an apple fell from the tree hit Newton's head. He rubbed his head, looked ripe apples rolled down the mud. Apple gave him a hint of
ripe apple, why it falls to the ground? Because wind blows reasonable? Not, vast space, why would fall down without flying to the sky? Thus the Earth has something sucked it back? Everything on earth has the weight, throwing away the stone that ultimately falls to the ground, the weight of things have to be the result of the Earth's gravity is not?
Later, Newton stated: Everything on earth are subject to the pull of the earth, the moon is also the attraction of the earth, and the earth is subject to the pull of the moon; Earth under the pull of the sun, the sun is also subject to the pull of the earth. In other words, as all things in the universe are mutual gravity, because this kind of gravitational pull that the new moon orbiting the earth, the earth orbits the sun
đang được dịch, vui lòng đợi..