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Hubble constant
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(cosmology) a measure of the rate at which the universe is expanding, determined from the observation of distant galaxies' recession velocities
例
Astronomers use the Hubble constant to estimate the age of the universe.
Precise measurements of the Hubble constant are crucial for cosmological models.
The value of the Hubble constant has been refined over the years.
The Hubble constant is expressed in kilometers per second per megaparsec.
The Hubble constant tells us how quickly the universe is expanding.
