| 单词 | Hubble constant |
| 释义 | Hubble constant The rate at which the velocity of recession of the galaxies increases with distance as determined by the redshift. The value is not agreed upon but current measurements indicate that it lies between 49 and 95 km s-1 per megaparsec. The reciprocal of the Hubble constant, the Hubble time , is a measure of the age of the universe, assuming that the expansion rate has remained constant. If, as seems likely, the expansion rate has slowed down with time as a result of gravitational attraction between the galaxies, the Hubble time gives an upper limit to the age of the universe of some 2 × 1010 years. The constant is named after Edwin Hubble |
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