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Definitions (304)
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atmosphere
(n.) Gaseous mass enveloping a planet or star.
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BIG BANG THEORY
(n.) A cosmological model, in which the universe was once compressed to infinite density and has been expanding ever since. Originally a term used by unbelieving scoffers, now as widely accepted as th [..]
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light-gathering power
(n.) The ability of a telescope to collect light from an astronomical source. The light-gathering power is directly related to the area of the primary mirror or lens.
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absolute magnitude
(n.) The magnitude that a star would appear to have if it were at a distance of ten parsecs from us.
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Accretion disk
(n.) A rotating disk of gas surrounding a compact object (such as a neutron star or black hole), formed by material falling inward.
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Albedo
(n.) Fraction of incident electromagnetic radiation reflected by a body such as a planet, star, or cloud.
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alpha particle
(n.) A cluster of two protons and two neutrons; a helium nucleus.
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Andromeda galaxy
(n.) The large spiral galaxy located some 700,000 parsecs from the sun; the most distant object visible to the unaided eye.
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Angstrom
(n.) Unit of length convenient for measuring wavelengths of electromagnetic radiation: 1 A = 10-10m.
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Ångström
(n.) Unit of length convenient for measuring wavelengths of electromagnetic radiation: 1 A = 10-10m.
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