What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of. ...
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Yes, you are right that astronauts found only 5% of the universe that is visible to us is made up to atoms. whereas 95% of it is not known yet. But the most popular theory tells us that the remaining part is made up of two entities- Dark energy and Dark matter.
where dark energy is associated with the universe's expansion, dark matter acts like an invisible glue, that binds up all the galaxies together in the universe.
In higher classes, if you opt to study physics, specially astrophysics and space science, you will get to know more about these two entities.
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