Gravitation or simply called gravity is the universal force of attraction acting between all matters. It is by far the weakest of all the four fundamental known force in nature and therefore plays no role in determining the internal properties of matter. While that might be true, it has a stellar reach and a universal action on all matter.
It controls the trajectories of all the celestial objects from asteroids, satellites, planets and even whole galaxies. On earth gravity is exerted on all objects and on the surface, the acceleration of gravity for a freely falling body is 9.8 metres per second which means that an object that is freely falling, its speed increases by about 9.8 metres per second.
Gravity is most accurately described by the general theory of relativity which describes gravity not as a force, but as a consequence of the curvature of space-time caused by the uneven distribution of mass.
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