The Law of Universal Gravitation
Combining the three laws of motion, Isaac Newton came up with The Law of Universal Gravitation. This law describes the major force acting in space, gravity.
The gravitational attraction between two objects pulls them together with a force that is proportional to the product of their masses and inversely proportional to the square of their separation.
This means that the greater each object's mass, the stronger the pull; however, the greater the distance between them, the weaker the pull. It's similar to a magnet's pull on a piece of metal. The closer the magnet, the stronger the magnetic pull. The farther the magnet, the weaker the pull.
Formula: F =
(Gm1m2) / d2
This relationship is also known as an inverse square law because as distance d increases squarely, force F decreases.