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The universe is all of space and time [ a ] and their contents. [ 10 ] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.
The universe contains all the energy and matter there is. Much of the observable matter in the universe takes the form of individual atoms of hydrogen, which is the simplest atomic element, made of only a proton and an electron (if the atom also contains a neutron, it is instead called deuterium).
Discover the universe: Learn about the history of the cosmos, what it's made of, and so much more.
Map. Stars Galaxies Nebula Exotic Exoplanet Galaxies Nebula Exotic Exoplanet
May 3, 2022 · The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy.
6 days ago · Unlike the observable universe, the universe is possibly infinite and without spatial edges. Zoom out from Earth's solar system to the Milky Way Galaxy, the Local Group, and beyond Scale of the universe.
The origin, evolution, and nature of the universe have fascinated and confounded humankind for centuries. New ideas and major discoveries made during the 20th century transformed cosmology – the term for the way we conceptualize and study the universe – although much remains unknown.
