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 Some theories suggest that G is changing over time and that G varies somewhat
in different regions of space!
 No matter how great the distance between an object and the Earth, the Earth's
gravitational force does not drop to 0. The gravitational influence of every object
is exerted through all space.
 Earth is round because of Gravity. Earth attracted itself together before it became
solid.
 There is gravitational attraction between two marbles, but we don't notice it
because the force between each of the marbles and the Earth is so much
greater.
 A person who weighs 100 pounds on the Earth would weigh only 17 pounds
standing on the same scale on the moon.
 According to Albert Einstein, there is no difference between the acceleration of
Gravity and any other acceleration. If you were in a rocket accelerating at 32.2
ft/sec2, it would feel just like gravity on the Earth.
 There are no known anti-gravity devices (ah shucks)! But the effects of Gravity
can be canceled by free-fall or by placing objects in orbit.