In cosmology, the constant that is intimately related to the present "age" of the universe is A) the constant in Wien's law of radiation. B) 1/G, the inverse of the universal gravitational constant. C) the Planck time, 10^-43 s, in which space and time came into existence. D) 1/H₀, the inverse of the Hubble constant of expansion.

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The Hubble constant (H) is directly related to the age of the universe through the Hubble time, which is the inverse of the Hubble constant. It provides an estimate of the time since the universe began to expand from the Big Bang, making it a key parameter in understanding the universe's age.

In Cosmology, the Constant That Is Intimately Related to the Present