Mass is the amount of MATTER in an object. The amount of matter depends on how many ATOMS there are. These atoms can be squeezed tightly together, in something dense, like a rock. Or they can have big spaces between the atoms, like in a piece of cotton. If you had pieces of rock and cotton that were the same size, the rock would have the greater mass.

The amount of gravitational force pulling any two objects together depends on the amount of their MASS---the greater their combined mass, the greater the attraction.

Weight is similar, but not quite the same thing as mass. Weight is a measure of the pull of gravity on an object. The pull we usually think of is that of the Earth, since that is where we usually are standing. But on planets with different mass, you would have a different weight. And in outer space, far from any major gravitational pull, you would weigh virtually nothing!

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