gravity, an attractive force felt between all objects, force, a push or pull that can cause an object to change its motion, mass, the amount of matter an object contains, Isaac Newton, British scientist who first came up with the mathematical ideas supporting gravity, weight, the measure of the force of gravity on an object, distance, how far apart two objects are, evidence, a sign which shows that something exists or is true, accelerate, a change in the speed or direction of motion of an object, rest, a state of no motion relative to the surroundings, parallel, side by side and always having the same distance between, lunar eclipse, when the moon passes directly behind the Earth and into the planet's shadow

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