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Every particle of matter attracts other particles with a particular force, called the gravitational force. Objects with more mass have a higher gravitational force.

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 ...

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.

starchild.gsfc.nasa.gov/docs/StarChild/questions/question30.html

Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the ...

www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-what-is-gravity.html

Gravity is a force pulling together all matter (which is anything you can physically ... The more matter, the more gravity, so things that have a lot of matter such as ...

briankoberlein.com/2015/02/26/cradle-to-grave

Feb 26, 2015 ... We often speak of gravity as a force. More accurately it is a feature of spacetime. Even more accurately, we don't know what it is.

www.pbs.org/wgbh/nova/physics/universe-gravity.html

May 8, 2014 ... A "cosmic fingerprint" reveals the universe's beginning and gravity's microscopic secrets.

science.howstuffworks.com/environmental/earth/geophysics/what-is-gravity.htm

The Road Runner cartoons play fast and loose with gravity. Given the opportunity , Wile E. Coyote usually chases his quick-footed foe off the edge of a cliff -- but ...

.ask.com/youtube?q=What+Is+Gravity%3F&v=xICEt51A-Ac
Feb 28, 2013 ... Hi, I'm Emerald Robinson, and in this "What Is" video we're going to discuss one of the biggest forces of nature: gravity. Most of us define gravity ...

www.livescience.com/37115-what-is-gravity.html

Jun 3, 2013 ... Gravity is the force of attraction that pulls two objects toward each other.