Calculate the recession velocity of a distant galaxy based on its distance and the Hubble constant.
Input Parameters
Calculation Results
Enter distance to calculate
About this calculator
Quick Reference
vRecession velocity
H₀Hubble constant
DProper distance
Overview
Hubble's Law states that the recession velocity of a galaxy is proportional to its distance from the observer. This is the primary evidence for the expanding universe.
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Pro Tips
The formula is v = H₀ * D.
The value of H₀ is currently estimated to be around 70 (km/s)/Mpc.
1 Megaparsec (Mpc) is approximately 3.26 million light-years.
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Fun Facts
"The universe doesn't have a 'center' that it is expanding from; instead, space itself is stretching everywhere."
"Because of expansion, some galaxies are moving away from us faster than the speed of light—but they aren't 'moving through' space that fast, space itself is expanding!"
"Edwin Hubble published the first evidence for this law in 1929, forever changing our view of the cosmos."
