I love these kind of questions as they are just the ones that I have as well. Not being a physicist I decided to look this one up as I only had a rough idea as to what scientists currently believe.
roughly 5% is made up of Atoms which is normal matter the building blocks of stars and planets (stuff in the periodic table)
25% is dark matter, which can’t be seen as it does not produce or absorb light. It has only been detected by measuring its gravity
70% is dark energy, about which we know very little other than it is effecting how the universe expands. However some scientist think that this Dark Energy does not exist!
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