宇宙年龄计算器 — 公式
## Estimating the Age of the Universe
The simplest age estimate comes from inverting the Hubble constant.
### Formula
**t_H = 1 / H0**
Converting H0 from km/s/Mpc to 1/s requires dividing by 3.086 x 10¹⁹ km/Mpc. The result, about 14 Gyr for H0 = 70, is close to the accepted age of 13.8 Gyr because dark-energy acceleration partially compensates for the deceleration of matter.
The simplest age estimate comes from inverting the Hubble constant.
### Formula
**t_H = 1 / H0**
Converting H0 from km/s/Mpc to 1/s requires dividing by 3.086 x 10¹⁹ km/Mpc. The result, about 14 Gyr for H0 = 70, is close to the accepted age of 13.8 Gyr because dark-energy acceleration partially compensates for the deceleration of matter.
计算示例
H0 = 70 km/s/Mpc.
- t_H = 1 / H0 in SI
- H0 in 1/s = 70 / 3.086e19 = 2.269e-18 s⁻¹
- t_H = 1 / 2.269e-18 = 4.407e17 s
- t_H = 4.407e17 / 3.156e16 = 13.96 Gyr