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noun Astronomy.
any model of the universe deduced from a homogeneous, isotropic solution of Einstein's field equations without a cosmological constant. Such models form the mathematical basis for many modern cosmologies and provide for expansion or contraction of the universe.
Also called Friedmann universe.
Origin:
named after Alexander Friedmann, (1885–1925), Russian mathematician, who made the necessary calculations in 1922
named after Alexander Friedmann, (1885–1925), Russian mathematician, who made the necessary calculations in 1922
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Friedmann model
is always a great word to know.
So is meteor. Does it mean:
| a celestial body with a mass of gas that is hot enough to produce and sustain nuclear fusion, thus producing luminosity |
| a transient fiery streak in the sky produced by a meteoroid passing through the earth's atmosphere also called a shooting star or bolide |
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