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Space and time, according to the prevailing cosmological theory of the Big Bang, emerged together 13.787 ± 0.020 billion years ago, [11] and the universe has been expanding ever since. Today the universe has expanded into an age and size that is physically only in parts observable as the observable universe, which is approximately 93 billion ...
Ordinary (baryonic) matter (4.9%) Dark matter (26.8%) Dark energy (68.3%) [ 6 ] The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach ...
The Sloan Great Wall, the Pisces–Cetus Supercluster Complex, the Horologium-Reticulum Supercluster and the Shapley Supercluster as seen in the 2dF Galaxy Redshift Survey. This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year ...
On the left, the dramatic expansion occurs in the inflationary epoch; and at the center, the expansion accelerates (artist's concept; neither time nor size are to scale). The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [ 1 ]
Fully 70% of the matter density in the universe appears to be in the form of dark energy. Twenty-six percent is dark matter. Only 4% is ordinary matter. So less than 1 part in 20 is made out of matter we have observed experimentally or described in the standard model of particle physics. Of the other 96%, apart from the properties just ...
List of states of matter. Matter organizes into various phases or states of matter depending on its constituents and external factors like pressure and temperature. In common temperatures and pressures, atoms form the three classical states of matter: solid, liquid and gas. Complex molecules can also form various mesophases such as liquid ...
1/3. A quark (/ kwɔːrk, kwɑːrk /) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. [ 1 ] All commonly observable matter is composed of up quarks, down quarks and electrons.
The term quasaroriginated as a contractionof "quasi-stellar [star-like]radio source"—because they were first identified during the 1950s as sources of radio-wave emission of unknown physical origin—and when identified in photographic images at visible wavelengths, they resembled faint, star-like points of light.
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