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The universe is the totality of all space and time, including all matter, energy, and structures formed by them.
The universe is defined as everything that exists— all forms of matter and energy and the structures they form—spanning all of space and time, including what has been, is, and will be. It contains planets, moons, stars, galaxies, and the contents of intergalactic space, and it is often discussed in terms of both physical reality and, in some philosophical views, abstract concepts such as mathematics and logic. In cosmology, the universe is also described by its evolution and large-scale organization. The prevailing Big Bang model explains that the universe began in an extremely hot and dense state and has been expanding for about 13.8 billion years, producing the observable universe (about 93 billion light-years across). On the largest scales, matter is approximately homogeneous and isotropic, while at smaller scales it forms a web of galaxies, clusters, filaments, and voids. The universe’s composition is dominated by dark energy and dark matter, with ordinary (baryonic) matter making up only a small fraction.
The universe is the totality of all space and time, including all matter, energy, and structures formed by them.
The Big Bang model describes the universe’s expansion from an early hot, dense state and supports the observed large-scale structure and composition.
The observable universe is limited by the finite speed of light, and its current size is about 93 billion light-years in diameter.
The universe is everything that exists: all space and time, all matter and energy, and the structures they form.
The portion of the universe from which light has had time to reach us, defining the region we can observe.
A cosmological model in which the universe began in a hot, dense state and has cooled and expanded over time.
The assumption that, on large scales, the universe looks the same in all locations (homogeneous) and in all directions (isotropic).
An unseen form of matter inferred from gravity that accounts for a large fraction of the universe’s mass-energy.
A mysterious energy component that drives the accelerated expansion of the universe.
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