Hip Glossary: Gravity

Gravity or Gravitation is a property by which all objects attract each other. Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton’s law of universal gravitation provides an excellent approximation in many cases.

Gravitation is the reason for the very existence of the earth, the sun, and other celestial bodies; without it, matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the earth and the other planets in their orbits around the sun, the moon in its orbit around the earth, for the formation of tides, and for various other natural phenomena that we observe.

Source:wikipedia