# How many light years away is Mars from earth?

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13
Mar 14, 2016

$4.2 \times {10}^{- 5}$ light years

#### Explanation:

Light-years is not an adequate measure for distances inside the solar system. Symply a light-year is a humongously large measure of distance.

The distance between Earth and Mars is at the most 400 million km, and could be as small as 55 million km.

https://en.wikipedia.org/wiki/Mars

Even with the larger distance we would obtain:

(400xx10^6 km )/(300000 km//s)~1333s , which is about 22 minutes. So Mars can be at the most 22 light-minutes from the Earth.

Just divide the time in seconds light takes between Earth and Mars, by the number of seconds within one year:

$\frac{1333}{365.25 \times 24 \times 60 \times 60} = 4.2 \times {10}^{- 5}$ light years

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8
Mar 14, 2016

Less than 1 light year.

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