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Hubble time
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Hubble time

astronomy
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Hubble time refers to the age of the universe as determined by the Hubble constant, which measures the rate of the universe's expansion. This constant, denoted as H0, is the proportionality constant in the relationship between the speed at which galaxies recede from Earth and their distance from us.12

The concept originated with Edwin Hubble's observations in 1929, which showed a linear relationship between a galaxy's velocity and its distance. This led to the understanding of an expanding universe. The reciprocal of the Hubble constant provides an approximate age of the universe, currently estimated to be between 13 and 14 billion years. There is ongoing scientific discussion, known as the "Hubble tension," regarding precise measurements of this constant.3412

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
6 Britannica Sources
  1. astronomy - Determining astronomical distances
  2. astronomy - Development of the big-bang theory
  3. How Fast Is the Universe Expanding?
  4. Hubble constant
  5. universe - Hubble’s research on extragalactic systems
  6. astronomy - Satellite observatories

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