| 单词 | Hubble parameter |
| 释义 | Hubble parameter (extremely rare) n WORD FAMILY Hubble parameter USAGE EXAMPLESA value called the reciprocal of the Hubble parameter is approximately equal to the age of the universe, or 13.7 billion years, he added. New York Times(Jan 21, 2013) n (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today Syn|Hyper Hubble constant, Hubble's constant, Hubble's parameter constant a number representing a quantity assumed to have a fixed value in a specified mathematical context |
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