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[[Image:Solar_sys8.jpg.jpg|right|thumb|Gravitation keeps the planets in orbit about the Sun. (Not to scale)]]
[[Image:2004-0423gravity-lg.jpg|right|frame]]
'''Gravitation''' is a natural [[phenomenon]] by which all objects with [[mass]] attract each other,<ref name="Does Gravity Travel at the Speed of Light?">[http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html Does Gravity Travel at the Speed of Light?], ''UCR Mathematics''. 1998. Retrieved [[3 July]] [[2008]].</ref> and is one of the [[fundamental forces]] of physics. In everyday life, gravitation is most commonly thought of as the agency that gives objects [[weight]]. It is responsible for keeping the Earth and the other planets in their [[orbit]]s around the Sun; for keeping the [[Moon]] in its orbit around the Earth, for the formation of [[tides]]; for [[convection]] (by which hot fluids rise); for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena that we observe. Gravitation is also the reason for the very existence of the [[Earth]], the [[Sun]], and most macroscopic objects in the [[universe]]; without it, matter would not have coalesced into these large masses and [[life]] as we know it would not exist.
'''Gravitation''' is a natural [[phenomenon]] by which all objects with [[mass]] attract each other,<ref name="Does Gravity Travel at the Speed of Light?">[http://math.ucr.edu/home/baez/physics/Relativity/GR/grav_speed.html Does Gravity Travel at the Speed of Light?], ''UCR Mathematics''. 1998. Retrieved [[3 July]] [[2008]].</ref> and is one of the [[fundamental forces]] of physics. In everyday life, gravitation is most commonly thought of as the agency that gives objects [[weight]]. It is responsible for keeping the Earth and the other planets in their [[orbit]]s around the Sun; for keeping the [[Moon]] in its orbit around the Earth, for the formation of [[tides]]; for [[convection]] (by which hot fluids rise); for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena that we observe. Gravitation is also the reason for the very existence of the [[Earth]], the [[Sun]], and most macroscopic objects in the [[universe]]; without it, matter would not have coalesced into these large masses and [[life]] as we know it would not exist.