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The universe is all of space and time and their contents, including matter, energy, physical laws, and structures. Learn about the origin, evolution, and fate of the universe, as well as its observable and unobservable parts, from ancient and modern cosmology.
Learn about the local and global geometry of the universe, and how it is constrained by gravity and observations. Find out the current evidence for a flat, open or closed universe, and the possible topologies and curvatures of different models.
Cosmos is an alternative name for the universe or its nature or order, implying a complex and orderly system or entity. Learn about the origin and meaning of the word, and the ancient Greek philosophers who studied the cosmos and its structure.
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Learn about the features, history, evidence, and problems of the Big Bang models, and how they relate to physics, astronomy, and cosmology.
The cosmological principle is the notion that the universe is uniformly isotropic and homogeneous on large scales. It implies a non-static universe and is used to test cosmological models, but it may be violated by some observations.
Learn about the origins, development, and methods of astronomy, the natural science that studies celestial objects and phenomena. Explore the history of astronomy from ancient times to modern days, and the different branches of the science, such as observational and theoretical astronomy.
The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it. Redshift is a phenomenon that indicates the expansion of the universe.
Cosmology is a branch of physics and metaphysics that deals with the nature, origin, and evolution of the universe. Learn about the history, disciplines, discoveries, and theories of cosmology, from ancient to modern times.