红移速度计算器 — 公式

## Redshift and Recession Velocity

For low redshifts (z << 1):

**v = z × c** where c = 299 792.458 km/s

Combined with Hubble's law v = H0 d gives approximate distance d = v / H0.

For z > 0.3, relativistic corrections are important.

计算示例

A galaxy has redshift z = 0.01.

  1. v = 0.01 × 299 792.458 = 2 998 km/s
  2. d ≈ v / H0 = 2998 / 70 = 42.8 Mpc
  3. About 140 million light-years.