Who invented the gravitation?
A popular story says that Newton came up with the theory of gravity instantly, when an apple fell from a tree and hit him on the head. Actually, Newton saw an apple falling from a tree, and it got him to thinking about the mysterious force that pulls objects to the ground. He compared the straight path of the apple to the curved path of a fired cannonball. He wondered what would happen if the cannonball went faster and faster, and realized it would eventually “fall” around the curve of the Earth forever, and never hit the ground. This “forever falling” motion describes the movement of the Moon around the Earth, and the Earth around the Sun.