Simply gravity

 1  What is matter?                                      Gravity Home Page

Matter is simply everything around you that takes up space and has weight, like your toys, clothes, and even the air you breathe. It can be a solid (like a rock), a liquid (like water), or a gas (like air). source

2   What is gravity?

1. Gravity is the force by which a planet or other body or object draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun. source
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3. Mass is a measure of how much matter is in an object, 
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5. while weight is a measure of  the pull of gravity on you, your weight.  You'll be lighter on the moon. source

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