To be pedantic, they are 99.99999 percent empty space. This means that if you were to enlarge an atom to the size of a watermelon or football, the atom's electrons and nucleus would be too small to detect with the naked human eye.
When you start to consider that atoms are about 99% empty space and they make up 100% of the universe, you can start to see: you're made up of nothingness. Every human on planet Earth is made up of millions and millions of atoms which all are 99% empty space.
In reality, atoms do not contain any empty space. Rather, they are filled completely with spread-out electrons, making the shrinking of atoms impossible.
Most of matter is in fact empty space. Each atom is 99.99% empty space.
In the currently popular model of the Universe, 70% is thought to be dark energy, 25% dark matter and 5% normal matter.
Plasma, the fourth state of matter, consists of charged atomic nuclei in a sea of electrons and accounts for the vast majority of the observable universe.
Stars like our Sun are made of ionised gas known as plasma. In fact, space is dominated by plasma – space scientists (astrophysicists) believe that about 99% of matter in the universe is plasma.
99.9999999% of your body is empty space.
There's a limit to how much of the universe we can see. The observable universe is finite in that it hasn't existed forever. It extends 46 billion light years in every direction from us.
The term dark matter was coined in 1933 by Fritz Zwicky of the California Institute of Technology to describe the unseen matter that must dominate one feature of the universe—the Coma Galaxy Cluster.
In life, the human body comprises matter and energy. That energy is both electrical (impulses and signals) and chemical (reactions).
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules. In a solid, the particles are very attracted to each other. They are close together and vibrate in position but don't move past one another.
But the overwhelming majority of the total matter in the Universe, the remaining 85%, is still missing. We call it dark matter; we know it can't be made out of the stuff normal matter is made of; about 1% (or slightly less) of it is neutrinos; the remaining 99%+ is still unknown.
There is an up and down in space. "Down" is simply the direction gravity is pulling you, and "up" is just the opposite direction. Since there is gravity everywhere in space, there is also an up and down everywhere in space.
Molecules are the collections of atoms, that is Water is composed of Oxygen and Hydrogen atoms, Proteins are made of Carbon, Hydrogen, Oxygen, and different components. Therefore, the molecules that make up the cells of the body are made of atoms. In the end, it is correct to say the body is made of cells.
As a universe, a vast collection of animate and inanimate objects, time is infinite. Even if there was a beginning, and there might be a big bang end, it won't really be an end. The energy left behind will become something else; the end will be a beginning.
The trite answer is that both space and time were created at the big bang about 14 billion years ago, so there is nothing beyond the universe. However, much of the universe exists beyond the observable universe, which is maybe about 90 billion light years across.
No, they don't believe there's an end to space. However, we can only see a certain volume of all that's out there. Since the universe is 13.8 billion years old, light from a galaxy more than 13.8 billion light-years away hasn't had time to reach us yet, so we have no way of knowing such a galaxy exists.
Again, atoms never touch in the everyday sense of the word for the simple reason that they don't have hard boundaries.
Most of the mass of your body is determined by protons and neutrons, which are made up of quarks. The kinetic and potential energy associated with these quarks is so intense that it makes up 98% of the mass of all matter.
The balance of kinetic and potential energy in an atom is what keeps its electrons from collapsing into the nucleus.
It turns out that roughly 68% of the universe is dark energy. Dark matter makes up about 27%. The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter - adds up to less than 5% of the universe.
Almost every galaxy can be classified as a spiral, elliptical, or irregular galaxy. Only 1-in-10,000 galaxies fall into the rarest category of all: ring galaxies.
The fifth form, the Bose-Einstein condensate (BEC), discovered in 1995, appears when scientists refrigerate particles called bosons to very low temperatures. Cold bosons merge to form a single super-particle that's more like a wave than an ordinary speck of matter.