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sci.Hubble-constant-recession Calculator
Calculates galaxy recession velocity from redshift: v = cz (for z ≪ 1) or relativistic formula for larger z, and distance from Hubble's law. The cosmological redshift of the CMB (z ≈ 1,100) is not a Doppler shift but an expansion of space since photon emission.
Inputs
H0 Km S Mpc
Reference formula or conversion factor shown for context.
Z Redshift
Reference formula or conversion factor shown for context.
Results
recession velocity v (km/s)
Sample size or count used in the calculation.
estimated distance (Mpc)
The computed distance or separation.
distance (billion light-years)
The computed distance or separation.
Hubble age estimate (Gyr)
The value at the specified point or condition.
v = H₀·d
Reference formula or conversion factor shown for context.
H₀ tension
The tensile force or stress — the pulling force that stretches the material. Must stay below the material's tensile strength.