Gravity, or gravitation, is a phenomenon that is natural. It operates on the principle that anything with mass will move towards each other. Stone thrown up falls to the ground and atoms and photons move to each other.
Earth
Water
Sun
Universe
Globe
Space
Matter
Ocean tide
Molecule
Matter
Universe
Atom
Atom
Universe
Molecule
Space
Isaac Newton
Albert Einstein
Napoleon Hill
Charles Darwin
Mass
Curvature of spacetime
Jupiter
Universe
Law of Mass
Matter
Spacetime event
Newton’s law of universal gravitation
Relativity
Quantum physics
Atomic mass
Black hole
Quantum gravity
Supergravity
Gravitational singularity
All of the above
Isaac Newton
John Lennon
Albert Einstein
Galileo Galilei