Question

State and explain Hubbles Law?

Answer 1

Step 1. Statement of Hubbles Law

1. Hubble’s law states that the distance to a galaxy is proportional to its recession velocity. Mathematically, this can be stated as
2. The Hubble’s law is not only evidence of the expansion of the universe, but also an important explanation to the big bang model.

Step 2. Mathematical explanation of Hubbles Law

$v=H_{0}d$

$v=$Recession velocity in km per second

$H_0=$Hubble constant

$d=$ Distance in Mpc

The Hubble effect shows the direct correlation between the earth's distance to a galaxy and its recessional velocity. Thus, numerically, Hubble’s law can be written as

$v\propto r$

where $v$ represents the recessional velocity in $km/s$ and $r$ represents the distance of the galaxy in Mpc