免费哈勃距离计算器
根据退行速度和哈勃常数计算天体距离。
距离
100.00 Mpc
Distance vs Recession Velocity
公式
## Hubble's Law **v = H0 × d** or equivalently **d = v / H0** - *v* = recession velocity (km/s) - *H0* = Hubble constant (≈70 km/s/Mpc) - *d* = distance in megaparsecs This linear relation holds well for galaxies not too far away (z < 0.1). For larger distances, cosmological models are needed.
计算示例
A galaxy recedes at 7 000 km/s with H0 = 70 km/s/Mpc.
- 01d = v / H0 = 7000 / 70 = 100 Mpc
- 02In Mly: 100 × 3.262 = 326.2 million light-years
常见问题
What is the Hubble constant?
It measures the current expansion rate of the universe. Current estimates range from about 67 to 73 km/s/Mpc depending on the method.
Why is there a Hubble tension?
Measurements from the early universe (CMB) give H0 ≈ 67, while local distance-ladder methods give ≈73. The discrepancy is not yet resolved.
Does Hubble's law mean we are at the centre?
No. Every point in an expanding universe sees all other points receding. There is no centre.