Matter

Matter is any substance that has mass and takes up space by having volume. All such objects in the cosmos are composed of atoms which are made up of interacting subatomic particles. Matter exists in states or phases of solid, liquid, and gas (for example water exists as ice, liquid water, and steam) but other states are possible, such as plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma.

Matter has a special relationship with energy called mass–energy equivalence whereby matter and energy can be used interchangeably and often is. The principle is described by the physicist Albert Einstein's famous formula: E=mc2.

About 69 percent of the matter/energy in the universe is contained in dark energy, dark matter makes up about 26 percent, atoms of hydrogen and helium make up about 5 percent, and higher elements, which make up the Earth and our own bodies, only make up a tiny 0.5 percent.

Based on its physical and chemical structure, matter is made up of molecules, which are made up of atoms, which are made up of protons, neutrons, and electrons.

Using the, all matter is made up of fermions which are made up of quarks and leptons. Leptons (the most famous being the electron), and quarks (of which baryons, such as protons and neutrons, are made) combine to form atoms, which in turn form molecules.

Baryonic matter does not include dark energy, dark matter, black holes or various forms of degenerate matter. Therefore only about 5% of the universe is made of baryonic matter. Hadronic matter can include 'ordinary' baryonic matter, or quark matter and degenerate matter.

Bosons (which include photons and the force carriers gluons) are massless (with zero rest mass) and are therefore not matter. Other energy phenomena such as light and gravitational waves are also massless, and also don't have mass-energy equivalence.

A tachyon has complex rest mass and is not massless. With tachyon theory all matter can be divided into three general classes:


 * Tardyons or bradyons are massive particles with non-zero rest mass, which can move at any velocity less than c = speed of light (normal matter)
 * Luxons are massless particles with zero rest mass, which can travel only at c (bosons)
 * Tachyons are complex particles with imaginary mass, which can only be superluminal and travel faster than c. They speed up as they lose energy. At zero energy they have infinite velocity and are present everywhere in the universe at the same time (transcendental tachyon). Albert Einstein said that special relativity implies that faster-than-light particles could be used to communicate backwards in time. The Higgs boson also has an imaginary mass in its uncondensed phase.

Exotic matter
Exotic energy and matter are found naturally in neutron stars or black holes or cosmic events such as supernovas or the Big Bang. All these matter types have an associated exotic energy.