| 单词 | Hubble's parameter |
| 释义 | Hubble's parameter (extremely rare) n WORD FAMILY Hubble's parameter 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 parameter, Hubble's constant constant a number representing a quantity assumed to have a fixed value in a specified mathematical context |
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