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
- 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.
- The Hubble constant is expressed in kilometers per second per megaparsec.
- Precise measurements of the Hubble constant are crucial for cosmological models.