A bike, a tree, a cloud, an ocean -- any object you can name -- it's all made of matter. Even YOU are made of matter. Matter is anything that takes up space and has mass. All matter is made of tiny particles called atoms. The only difference between different kinds of matter -- whether you're talking about bugs, rocks, humans, or stars -- is the way their atoms fit together.

Made of: tiny particles called atoms
States of matter:solid, liquid, gas
Solid: a substance that keeps its size and shape
Liquid: a substance that flows freely like water
Gas: a substance that has no fixed shape and tends to expand without limit
Cool fact: If you took the space out of all the matter in New York City, Manhattan would fit in a matchbox. Matter has lots of space in it.

Image credits: main image: Eric Hamilton.