Calculate the recession velocity of a galaxy or its distance from Earth using Hubble's constant.
Cosmological Parameters
Mpc
km/s/Mpc
Cosmic Results
Enter cosmological parameters to calculate
About this calculator
Quick Reference
vRecession Velocity
dProper Distance
H0Hubble Constant
1 Mpc≈ 3.26 Million Light-Years
Overview
Hubble's Law describes the observation that galaxies are moving away from Earth at speeds proportional to their distance. This is the fundamental evidence for the expansion of the universe.
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Pro Tips
The value of H0 is typically between 67 and 73 (km/s)/Mpc.
1 Megaparsec (Mpc) is approximately 3.26 million light-years.
Calculating recession velocity helps determine the redshift (z) of distant objects.
The 'Hubble Age' of the universe is roughly 1/H0.
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Fun Facts
"Edwin Hubble published this law in 1929 after observing redshifts of distant galaxies."
"Galaxies aren't moving through space; space itself is expanding between them."
"The Hubble Constant is one of the most important but also most debated numbers in cosmology."
