# Hubble's Law

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**Formula:**`v = H0 × D`

## Introduction to Hubble's Law

Hubble's law describes the expansion of the universe. It states that the velocity of a receding galaxy is directly proportional to its distance from the observer. In this formula, ** v** is the velocity of the galaxy,

**(Hubble constant) is the constant of proportionality, and**

*H0***is the distance of the galaxy from the observer.**

*D*## Parameter usage:

`velocity`

= velocity of the galaxy`distance`

= distance of the galaxy from the observer

## Output:

`v`

= velocity of the galaxy

## Data validation

The velocity and distance should be greater than zero.

## Summary

This formula helps in understanding the movements of celestial objects and the expansion of the universe.

Tags: Cosmology, Astronomy, Hubble S Law