Inverse Square Law: A mathematical relationship stating that the strength of a physical quantity (like gravitational force) decreases with the square of the distance.
Newton's Law of Universal Gravitation: The law that states every particle in the universe attracts every other particle with a force directly proportional to their masses and inversely proportional to the square of their distances apart.
Gravitational Field: The region around an object where another object experiences a gravitational force due to its mass.