Calcolatore Tempo di Hubble — Formula

The Hubble Time

The Hubble time is the reciprocal of the Hubble constant, giving the time scale of the present expansion.

Formula

t_H = 1 / H0

To convert, note that 1 km/s/Mpc = 1 / (3.086 x 10¹⁹ s).

The Hubble radius c / H0 defines the distance at which the recession velocity equals the speed of light.

Esempio Risolto

H0 = 70 km/s/Mpc.

  1. t_H = 3.086e19 / H0
  2. t_H = 3.086e19 / 70 = 4.409e17 s
  3. In Gyr: 4.409e17 / 3.156e16 = 13.97 Gyr
  4. Hubble radius = c / H0 = 299800 / 70 ≈ 4283 Mpc