Enter the proper distance and the Hubble constant into the calculator to determine the velocity of a galaxy.

Hubble’s Law Formula

The following formula is described in Hubble’s law to calculate the velocity of a galaxy. 

v = H0 * d
  • Where v is the velocity (km/s)
  • H0 is the Hubble constant (km/s/Mpc) (Mpc = mega-parsecs)
  • d is the distance to the galaxy (Mpc)

To calculate the velocity of a galaxy, multiply the distance to the galaxy by the Hubble constant.

Hubble’s Law Definition

Hubble’s law is an equation that describes the speed at which a galaxy is moving away from our own in our expanding universe.

What does Hubble’s law tell us about the universe?

Hubble’s law tells us that the universe is expanding at an ever-increasing rate and the further away an object is from our reference point the fast it is moving and the fast it is accelerating.

How is Hubble’s law used to measure distance?

Hubble’s law can be used to measure distance when an estimated velocity can be known. From that, the distance can be calculated using the formula v = H0 * d.

What is Hubble’s law in simple terms?

In simple terms, Hubble’s law is the scientific phenomenon that states the universe is getting bigger and bigger at a faster and faster rate. The further away an object is, the factor is moving.

Hubble’s Law Example

How to calculate the speed of a galaxy?

  1. First, determine the Hubble Constant.

    Calculate the Hubble constant for the galaxy. This is typically considered 67.4 km/s/Mpc but can vary slightly depending on the study used.

  2. Next, determine the proper distance.

    Calculate the distance to the galaxy in question.

  3. Finally, calculate the velocity.

    Calculate the velocity of the galaxy with respect to our own using the formula above.

FAQ

What is Hubble’s constant?

Hubble’s constant is a constant that describes the relationship between the relative speed of another galaxy and the distance from our own.

hubble's constant calculator
hubbles constant formula