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In 2012, Cary and Michael Huang released The Scale of the Universe 2, in which clicking on objects brings up infoboxes that display information about them. [6] [7] [8] On 7 October 2018, The Scale of the Universe was featured on NASA's Astronomy Picture of the Day. [9]
Video of a cosmological simulation of the local universe, showing large-scale structure of clusters of galaxies and dark matter [56] Sky surveys and mappings of the various wavelength bands of electromagnetic radiation (in particular 21-cm emission ) have yielded much information on the content and character of the universe 's structure.
An overall dimensionless length scale factor R describes the size scale of the universe as a function of time (an increase in R is the expansion of the universe), [152] and a curvature index k describes the geometry.
The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [ 1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it. To any observer in the universe, it appears that all but the nearest galaxies ...
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [ 1] It was first proposed as a physical theory in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom". Various cosmological models of the Big ...
Astronomy portal. v. t. e. The Lambda-CDM, Lambda cold dark matter, or ΛCDM model is a mathematical model of the Big Bang theory with three major components: a cosmological constant, denoted by lambda (Λ), associated with dark energy. the postulated cold dark matter, denoted by CDM. ordinary matter. It is referred to as the standard model of ...
e. In physical cosmology, the shape of the universe refers to both its local and global geometry. Local geometry is defined primarily by its curvature, while the global geometry is characterised by its topology (which itself is constrained by curvature). General relativity explains how spatial curvature (local geometry) is constrained by gravity.
Scale factor (cosmology) The expansion of the universe is parametrized by a dimensionless scale factor . Also known as the cosmic scale factor or sometimes the Robertson–Walker scale factor, [ 1] this is a key parameter of the Friedmann equations . In the early stages of the Big Bang, most of the energy was in the form of radiation, and that ...