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Is Hubble time a coincidence?
What is Hubble time?
Is the Hubble time the right age for the universe?
Why is the Hubble time different from the real age?
The Hubble constant has units of inverse time; the Hubble time t H is simply defined as the inverse of the Hubble constant, i.e. t H ≡ 1 H 0 = 1 67.8 ( k m / s ) / M p c = 4.55 × 10 17 s = 14.4 billion years . {\displaystyle t_{H}\equiv {\frac {1}{H_{0}}}={\frac {1}{67.8\mathrm {~(km/s)/Mpc} }}=4.55\times 10^{17}\mathrm {~s} =14.4{\text ...
Based on the fundamental physics that scientists believe has driven the evolution of the universe, the Hubble constant should be around 68 km/s/Mpc—but this doesn’t match up to observations of the actual stars and galaxies astronomers see around us.
The size of the observable Universe is easily calculated. We have seen that the age of the Universe is 13.8 billion years. If the Universe was static, we would only be able to see objects 13.8 billion light-years away. Light from anything farther away would not have had time to reach us.
Apr 11, 2022 · The age of the universe estimated in this way turns out to be just the reciprocal of the Hubble constant (that is, 1/\(H\)). This age estimate is sometimes called the Hubble time. For a Hubble constant of 20 kilometers/second per million light-years, the Hubble time is about 15 billion years.
The age of the universe estimated in this way turns out to be just the reciprocal of the Hubble constant (that is, 1/H). This age estimate is sometimes called the Hubble time. For a Hubble constant of 20 kilometers/second per million light-years, the Hubble time is about 15 billion years.
Apr 5, 2024 · Robert Smith. Hubble constant, in cosmology, constant of proportionality in the relation between the velocities of remote galaxies and their distances. It expresses the rate at which the universe is expanding. It is denoted by the symbol H_0 and named in honor of American astronomer Edwin Hubble.
The Hubble time is about 14 billion years. The estimated current age of the Universe is about 13.7 billion years. Is the reason these two time are so close (a) a coincidence, or (b) a reflection that for much of its history the Universe has been expanding at a constant rate?
