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en.wikipedia.org/wiki/Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward (or gravitate toward) one another, including planets, stars and galaxies. Since energy and mass are equivalent, all forms of energy, including light, also cause gravitation and are under the ...

math.ucr.edu/home/baez/physics/Relativity/GR/gravity.html

The particular advantage of this theory of gravity (General Relativity) is that it ... the distortion of space-time caused by the presence of the earth accelerates your  ...

www.livescience.com/1770-greatest-mysteries-gravity.html

Aug 10, 2007 ... Science can measure gravity, but its source eludes discovery.

helios.gsfc.nasa.gov/qa_gp_gr.html

My friend thinks gravity is caused by the Earth spinning, and I think it is caused by the Earth weighing so much we ...

www.universetoday.com/75705/where-does-gravity-come-from

Gravity. The average person probably doesn't think about it on a daily basis, but ... mass of an object causes the space around it to essentially bend and curve.

spaceplace.nasa.gov/what-is-gravity

Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

www.thenakedscientists.com/forum/index.php?topic=9197.0

what i mean is that is it caused by the earth's spinning motion?? or what? if not than what causes the earth to spin?? why is it spinning??

sciencing.com/causes-gravity-earth-8579888.html

Gravity is the force of attraction between all matter. Although gravity exists for even small amounts of matter, the force is usually not significant enough to detect  ...

www.simplegravity.com

The cause of gravity remains illusive despite exhaustive mental effort applied to the subject. This is an intuitive contribution to the theory of gravity.

www.dailyherald.com/article/20120124/news/701249876

Jan 24, 2012 ... Gravity is the force that gives weight to objects and causes every particle to be attracted toward every particle. "Gravity is a force that acts ...