Portal:Cosmology

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The Cosmology Portal File:DarkMatterPie.jpg In physical cosmology and astronomy, dark energy is an unknown form of energy which permeates all of space and tends to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate. According to the Planck mission team, and based on the standard model of cosmology, on a mass–energy equivalence basis, the observable universe contains 26.8% dark matter, 68.3% dark energy (for a total of 95.1%) and 4.9% ordinary matter. Again on a mass–energy equivalence basis, the density of dark energy (6.91 × 10−27 kg/m3) is very low: in the solar system, it is estimated only 6 tons of dark energy would be found within the radius of Pluto's orbit. However, it comes to dominate the mass–energy of the universe because it is uniform across space. Did you know... ... that space is flexible, and has been expanding at a measurable rate since the beginning of time? ... that most of the atoms in our bodies were created in stars through fusion? ... that the Earth isn't flat, but the universe is? Based on Einstein’s Theory of General Relativity, there are three possible shapes that the Universe may take: open, closed, and flat. Once again, measurements by WMAP on the CMBR have revealed a monumental confirmation – the Universe is flat. ... that the average density of visible matter in the universe is about 10-30 g/cm3? ... that the temperature of the cosmic microwave background is 2.7 K? ... that the Earth is neither the center of the Universe nor the galaxy, because the universe has no center? ... that considering only the largest structures, the Universe is made up of filaments, voids, superclusters, galaxy groups and clusters? By combining galaxy groups and clusters, we come up with superclusters. Some superclusters in turn form part of walls, which are also parts of filaments. Georges Lemaître was a Belgian priest, astronomer and professor of physics at the French section of the Catholic University of Leuven. He was the first known academic to propose the theory of the expansion of the universe, widely misattributed to Edwin Hubble. He was also the first to derive what is now known as Hubble's law and made the first estimation of what is now called the Hubble constant, which he published in 1927, two years before Hubble's article. Lemaître also proposed what became known as the Big Bang theory of the origin of the Universe, which he called his "hypothesis of the primeval atom" or the "Cosmic Egg". Map of the sky in microwaves Cosmology is the study of the origin, evolution, and eventual fate of the universe. Physical cosmology is the scholarly and scientific study of the origin, evolution, large-scale structures and dynamics, and ultimate fate of the universe, as well as the scientific laws that govern these realities. Religious cosmology (or mythological cosmology) is a body of beliefs based on the historical, mythological, religious, and esoteric literature and traditions of creation and eschatology. WikiProject Cosmology WikiProject Solar System WikiProject Astronomy WikiProject Spaceflight WikiProject Physics WikiProject Science WikiProject Astronomical objects WikiProject Philosophy
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