Answer:
Dark Matter.
The thing is, most people think it's atoms, but, dark matter makes up these atoms, and then, the atoms make up everything else. So, your answer would be, Dark Matter.
The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.
Explanation:
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