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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, and other physical objects. Since energy and mass are equivalent, all forms of energy (including light) cause gravitation and are under the influence of it.

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.

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

Apr 25, 2017 ... Gravity is the force of attraction between all matter. Although gravity exists for even small amounts of matter, the force is usually not significant ...

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

Dec 5, 2013 ... So, what is gravity and where does it come from? ... simply put, the mass of an object causes the space around it to essentially bend and curve.

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

Jan 24, 2012 ... We know gravity exists because of what doesn't happen. ... Gravity is the force that gives weight to objects and causes every particle to be ...

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.louisdelmonte.com/what-causes-gravity

Apr 2, 2015 ... It may be hard to believe that the cause of gravity continues to remain one of the great mysteries of science, even to this day. This article will ...