For other uses, see Gravitation (disambiguation), Gravity (disambiguation).

In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force, or time-space itself is envisioned as discrete in nature, or both.

The gravitational attraction of the Earth endows objects with weight and causes them to fall to the ground when dropped (the earth also moves toward the object, but this is so small the effects are negligible at best ). Moreover, 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.

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Gravity - Twitter Search

@janole Hope everthing turns well before the weekend! Running #gravity on E72 in demo, works great! Just waiting for license transfer :p
stingerx (Steven Chan) Tue, 01 Dec 2009 08:58:12 -0000
@janole Hope everthing turns well before the weekend! Running #gravity on E72 in demo, works great! Just waiting for license transfer :p
@NarzE ทำไมถึงเป็น Gravity Preview อะ หรือยังเป็นเบต้า
gobman24 (gobman24) Tue, 01 Dec 2009 08:55:45 -0000
@NarzE ทำไมถึงเป็น Gravity Preview อะ หรือยังเป็นเบต้า
#MusicMonday(g)girlfriend-avril lavigne.Give them bloodmy chemical romance.Godspeed-Dixie chicks Gravity-John Mayer.Gun shy-Natalie merchant
jaid2k (Tarayn Johnson) Tue, 01 Dec 2009 08:54:30 -0000
#MusicMonday(g)girlfriend-avril lavigne.Give them bloodmy chemical romance.Godspeed-Dixie chicks Gravity-John Mayer.Gun shy-Natalie merchant
Gravity is the best twitter app for Nokia #Gravity
naat541 (Nawaf) Tue, 01 Dec 2009 08:54:00 -0000
Gravity is the best twitter app for Nokia #Gravity
♥track Machine – Gravity Attack http://bit.ly/7qPSsT #lastfm
shiratori (しらとり（｀エ´）ﾋﾟｬｰ) Tue, 01 Dec 2009 08:50:47 -0000
♥track Machine – Gravity Attack http://bit.ly/7qPSsT #lastfm
Loving gravity twitter app on my phone. I can tweet 24/7 now. Just an update to y'all still sick. Wont be able to go to class today..
pransya (Franz Presinede) Tue, 01 Dec 2009 08:50:31 -0000
Loving gravity twitter app on my phone. I can tweet 24/7 now. Just an update to y'all still sick. Wont be able to go to class today..

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