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Hubble constant
01
哈勃常数, 哈勃常数
(cosmology) a measure of the rate at which the universe is expanding, determined from the observation of distant galaxies' recession velocities
Example
The Hubble constant tells us how quickly the universe is expanding.
Astronomers use the Hubble constant to estimate the age of the universe.
The value of the Hubble constant has been refined over the years.
