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The universe is the totality of all space and time, including all matter, energy, and the structures they form.
The universe is defined as everything that exists— all forms of matter and energy, and the structures they form—spanning all space and time. It includes objects such as planets, stars, galaxies, and the contents of intergalactic space, and it is often described as the totality of what has been, is, and will be. Some philosophical and scientific views also argue that abstract concepts (like mathematics and logic) may be included in the definition. Modern cosmology describes the universe as expanding for about 13.8 billion years, beginning from an extremely hot, dense early state associated with the Big Bang. The observable universe is limited by the finite speed of light; it is roughly 93 billion light-years in diameter today, while the total size of the universe (finite or infinite) remains unknown. On the largest scales, matter is observed to be broadly uniform and isotropic, while at smaller scales it forms complex structures such as clusters, superclusters, filaments, and voids.
The universe is the totality of all space and time, including all matter, energy, and the structures they form.
Cosmology supports an expanding universe that began from a hot, dense early state (Big Bang), with an observable region limited by the particle horizon.
The universe’s total size is unknown, but its large-scale distribution appears roughly uniform, while smaller scales show a web-like structure.
The universe is everything that exists— all space and time, all forms of matter and energy, and the structures they form.
The region of the universe from which light (and other signals) have had time to reach us since the beginning of the universe.
The maximum distance from which particles could have traveled to the observer over the age of the universe, setting the limit of observability.
The prevailing cosmological model describing the universe’s early extremely hot and dense state followed by expansion and cooling.
The assumption that the universe is homogeneous and isotropic on sufficiently large scales.
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