What is the universe made of?
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The universe is made up of energy and matter.
The light that we see by is a type of energy
and comes in the form of individual particles called
photons.
The universe's matter includes atoms made up
of particles like electrons, protons, and neutrons.
When an atom has the same number of electrons, which
are negatively charged, and protons, which are positively
charged, we call it neutral.