How many light-years away is Mars from earth?
Step 1: Express light-years in
A light-year is defined as the distance traveled by light in one year.
The speed of light in vacuum is .
We know that,
In light travels .
Therefore, in light will travel
Step 2: Calculate distance in light-years
The distance between Earth and Mars
Therefore this distance in light year is,
Hence, there is light years of distance between Mars and Earth.