Reference Terms
from Wikipedia, the free encyclopedia

Gravitation

Gravity is a force of attraction that acts between bodies that have mass.

Gravity 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.

Gravity 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 tides, and for various other natural phenomena that we observe.

Note:   The above text is excerpted from the Wikipedia article "Gravitation", which has been released under the GNU Free Documentation License.
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May 25, 2015

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