n
Abbreviation of zero gravity. [The state of apparent weightlessness which occurs in a very low gravity field, or in free fall.]
n
(astronomy, astrophysics) A theory that describes and seeks to explain the seemingly increasing rate of the expansion of the universe.
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(relativity) A type of spacetime metric. See warp bubble.
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(astronomy) A measure of how much a quasar resembles a standard "broad absorption line" quasar
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(brane cosmology) A hypothetical higher-dimensional space within which our own four-dimensional universe may exist.
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(astronomy) The dynamics of celestial bodies subject to mutual gravitational attraction.
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A conjecture that expects that all spacetime singularities are enclosed within event horizons.
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A point of infinite positive spacetime curvature because of an infinite gravitational field
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A cosmically-scaled string of mass-energy left over from the big bang as a topological defect in spacetime.
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(astronomy) A mathematical theory that attempts to describe the evolution of the constituents of the universe following the Big Bang
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(astronomy) That part of any redshift that is accounted for by the expansion of spacetime following the Big Bang
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(space science) A crater or other depression, on a solid, non-luminous celestial body, the interior of which contains one or more points which lie in perpetual shadow due to a combination of high latitude and being on a celestial body with low axial tilt.
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(physics) A volume whose radius is the Debye length, in which there is a sphere of influence, and outside of which charges are electrically screened.
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(astronomy, physics) A gravitational lens configuration resulting in four duplicated images of the back ground image around the central gravitationally lensing object, in a cross configuration.
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(astrophysics) The minimum speed needed to escape the gravitational field of a planet or other body.
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The velocity of a circular orbit.
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Alternative form of frame dragging [(physics) The bending out of shape of space and time near a rotating body, as predicted by general relativity.]
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Alternative spelling of g-force [The acceleration of a body, relative to the freefall acceleration due to any local gravitational field, expressed in multiples of g0 (the mean acceleration due to gravity at the Earth's surface).]
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The acceleration of a body, relative to the freefall acceleration due to any local gravitational field, expressed in multiples of g0 (the mean acceleration due to gravity at the Earth's surface).
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Alternative form of gravity assist [(astrophysics) The favorable alteration of the speed and trajectory of a spacecraft as a result of its passing near to a celestial body.]
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(proscribed) A gravitational wave.
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Alternative form of gravity assist [(astrophysics) The favorable alteration of the speed and trajectory of a spacecraft as a result of its passing near to a celestial body.]
adj
(physics, astronomy) Relating to turbulence during the gravitational collapse of a star
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(physics) a body that radiates energy having a blackbody distribution reduced by a constant factor
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(cosmology, astrobiology, astronomy) An era of a Big Bang based universe with the physical laws of our Universe, where the cosmic microwave background is energetic enough to heat water into a liquid state, making all bodies beyond the inner limit of the habitable zone possible in hosting liquid water regardless of the amount of insolation provided by the local star.
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(astronomy) The astronomer Edwin Powell Hubble.
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(astrophysics, cosmology) The motion of galaxies due to the expansion of the universe
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(astronomy) A law stating that the velocity at which a distant object is receding from the Earth (as measured by its redshift) is proportional to its distance; observational evidence for an expanding universe.
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(cosmology) Hubble volume
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(astronomy, cosmology) A constant defined as 1/H_0, where H_0 is the Hubble constant. 1/H_0 is equal to 4.55×10¹⁷ seconds or 14.4 billion years.
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Alternative form of Hubble law [(astronomy) A law stating that the velocity at which a distant object is receding from the Earth (as measured by its redshift) is proportional to its distance; observational evidence for an expanding universe.]
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The presence of an apparently increased gravitational field in an accelerating or rotating situation.
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(astronomy) A velocity greater than escape velocity.
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(cosmology) The inflationary epoch of the Universe, where the size of the space of universe expanded at speeds beyond the speed of light. One of the Ages of the Universe. The cosmic era when most formulations of Big Bang theory start their timelines.
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The geometry of empty spacetime around a rotating uncharged axially-symmetric black hole with a spherical event horizon.
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(physics, general relativity) A coordinate system suited to the geometry of certain kinds of black hole.
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(artificial intelligence) The point, resulting from ever-accelerating technological progress, when a sufficient threshold of self-evolving artificial intelligence is reached to result in a superintelligence beyond human conception.
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(of a black hole) Synonym of photon sphere
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(astronomy) Synonym of Hubble law
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(physics): In special relativity, the pattern describing the temporal evolution of a flash of light in Minkowski spacetime. This is modeled in 3-space using the two horizontal axes as spatial dimensions, while the vertical axis is time.
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(physics, astronomy) The optical effect where the edge of the disk of a star appears darker than the center of the disk.
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(physics) A small superspace, especially a spherically symmetric quantum bubble.
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(mathematics) The problem of predicting the motion of a group of celestial objects that interact with each other gravitationally.
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The hypothesis that life-exterminating events such as gamma-ray bursts have acted as a galactic regulation mechanism in the Milky Way upon the emergence of complex life in its habitable zone.
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(astronomy) The detection and study of neutrinos, in order to investigate astronomical objects and the universe.
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A theorem postulating that all black hole solutions of the Einstein-Maxwell equations in general relativity can be completely characterized by only three externally observable classical parameters: mass, electric charge, and angular momentum.
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(physics) A test of the strong equivalence principle of general relativity that relies on detecting polarization in the orbit of the moon in the direction of the sun.
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(astronomy) One of the parameters needed to uniquely specify a particular orbit.
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(astronomy) The surface (plane) that contains an orbit.
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The predicted path of the evolution of the von Neumann entropy of a black hole undergoing Hawking radiation through its lifetime, where the Hawking radiation radiates away the quantum information stored within the black hole, to avoid violating the Law of Conservation of Quantum Information.
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A hypothetical process whereby the ergosphere of a black hole can be used as an energy source due to its angular momentum.
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(of a black hole) Synonym of photon sphere
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(of a black hole) A region of around a black hole where photons travel in orbits around the singularity, just beyond the event horizon.
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(physics) angular frequency (in radians per second)
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The production of a redshift
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(cosmology) The epoch of reionization of the Universe, where matter decoupled from energy, and space became transparent to radiation. One of the Ages of the Universe. The cosmic era when ultraviolet radiation of the first (Population III) stars and quasars ionized neutral hydrogen, ending the Cosmic Dark Age(s).
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(astronomy) A influence of the gravitational forces of one orbiting object on the orbit of another, causing periodic perturbations.
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(astrophysics, astronomy) A method to develop triaxial equilibrium kinematic models of actual galaxies (without knowledge of the motions of the component elements of the actual galaxies) using a grid and assigning masses and orbits, simulating gravitational evolution with the resulting estimated distributions, to compare with the actual galaxy, until a model results in similarity with the actual galaxy.
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by extension, escape velocity of the home body
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(astronomy) A cosmological model of the universe in which matter is continuously created as the universe expands
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by extension, the escape velocity of a star system
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(astronomy) The formation of a dynamic equilibrium in a system of collisionless particles modelled as being subject only to Newtonian gravity (galaxy, other stellar system, or galaxy cluster).
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(physics, historical) An obsolete scientific theory, chiefly developed by René Descartes, which attempted to explain celestial mechanics and the phenomena now described as gravitation by positing a system of fluid vortices governed by centrifugal forces and extending outwards from the sun.
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Alternative form of zero G [zero gravity]
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Alternative form of zero G [zero gravity]
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