The universe is around 70% dark energy (a.k.a. empty space). The rest is mostly dark matter, with a few percent for ordinary matter. That is the current scientific model.
Hydrogen is the most abundant element in the universe.
Most of the mass of visible matter in the universe is composed of baryonic matter, which includes ordinary atomic particles such as protons, neutrons, and electrons. This baryonic matter primarily forms stars, planets, and galaxies, with hydrogen and helium being the most abundant elements. Additionally, a significant portion of this mass is found in interstellar gas and dust. However, it is important to note that visible matter constitutes only a small fraction of the total mass-energy content of the universe, with dark matter and dark energy making up the majority.
Most of the universe is occupied by dark energy and dark matter. Dark energy, which is believed to make up about 68% of the universe, is thought to drive its accelerated expansion, while dark matter accounts for about 27% and exerts gravitational effects on visible matter. Ordinary matter, which includes stars, planets, and galaxies, constitutes only about 5% of the universe. Thus, the majority of the universe remains largely unexplained and invisible to direct observation.
In Olber's paradox, the 2 most important assumptions made were 1) The Universe is infinite. 2) The Universe is static and infinitely old.
If you define the "visible universe" as objects emitting light or electromagnetic radiation that can be seen or visualized from earth, then plasma makes up essentially all of it.In our solar system, the sun which is more massive than all the planets is made up almost entirely of plasma. Of course, the planets with perhaps the exception of the gas giants are made up of normal matter. But, they are just a tiny drop in the universe. We are unable to see planets in any of the other billions of solar systems. A few planets have been postulated, but are essentially invisible from earth.Even if we assumed every star had planets like our sun, the mass of these planets would be negligible.If you include all the blackness of space, then it is probably mostly void of matter, although the matter that is there would still be ions and plasma.
Hydrogen
Hydrogen.
Hydrogen.
It is made of atoms, ions, fundamental atomic particles.
The most abundant gas in the universe is hydrogen. Hydrogen atoms make up about 75% of the universe's elemental mass.
Matter is made of atoms, vast collections of atoms. Differences in matter are due to different amounts of protons and neutrons in the atom. Elements are distinguished by the number of protons, whereas isotopes (same element but different mass) are determined by the number of neutrons.
Most of the universe is made up of hydrogen gas, followed by helium. These two gases are the most abundant elements in the universe and can be found in stars, galaxies, and interstellar space.
Most probably quarks, since everything in the universe except light is made of it.
Plasma. It makes up more than 99% of visible matter in the universe, and most of the invisible matter.
The most abundant element in the universe is hydrogen.
Hydrogen is the most abundant element in the universe.
The most abundant element in the universe is hydrogen, which makes up about three-quarters of all matter! Helium makes up most of the remaining 25%