Gravity is defined as an attraction between two objects. Everything in the Universe with mass has gravity, but only large objects like planets or moons have a gravity strong enough to affect other things.
http://www.windows.ucar.edu/tour/link=/kids_space/gravi...
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Gravity is a force pulling together all matter (which is anything you can physically touch). The more matter, the more gravity, so things that have a lot of matter such as planets and moons and stars pull more strongly. Mass is how we measu...
http://www.qrg.northwestern.edu/projects/vss/docs/space...
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You jump up, and gravity brings you back down to Earth. You reach the brow of a hill and gravity accelerates you down the other side. All neat and tidy then: gravity behaves in the way Newton thought of it, as a force that affects and changes the motion of something else.
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www.newscientist.com/article/mg20227122.700-gravity-mys...
www.newscientist.com/article/mg20227122.700-gravity-mysteries-what-is-gravity.html
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Gravity is our oldest and most familiar enemy, the force we feel in our bones, the force that will eventually bury us, sagging our organs and pulling us down, but for all its intimacy, it is a mystery. What really is the law?
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www.nytimes.com/2003/11/11/science/11GRAV.html
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Gravitation - Wikipedia, the free encyclopedia
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Gravitation is a natural phenomenon by which objects with mass attract one another. In everyday life, gravitation is most commonly thought of as the agency which lends weight to objects with mass. Gr...
en.wikipedia.org/wiki/Gravitation
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== Gravity == Gravity is the force that exists between things that have mass. It is not understood why it exists, but its effects are well known and quantifiable. When asked what causes it, Sir Isaac Newton said that he "feigned no hyp...
http://wiki.answers.com/Q/What_dose_gravity_do
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Gravity is the force that keeps humans from floating around the Earth. This force is basically exerted on objects on Earth by Earth. It keeps everyone and thing on the ground.
http://answers.ask.com/Science/Physics/what_is_gravity
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The Reduced Gravity Education Flight Program provides a unique academic experience for undergraduate students to successfully propose, design, fabricate, fly and evaluate a reduced gravity experiment of their choice.
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microgravityuniversity.jsc.nasa.gov/
microgravityuniversity.jsc.nasa.gov/
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