The speed of light is around 3.000E5 km/s. It takes approximately 9.221 seconds for light reflected from the moon Vega to reach planet Xartan. What is the average distance from the moon Vega to the planet Xartan?

Explanation:

Speed

The speed is calculated as the ratio of the distance d by the time t:

If we need to calculate the distance, the equation is solved for d:

d=v*t

The speed of light is

It takes t=9.221 seconds for light reflected from the moon Vega to reach planet Xartan.

We can calculate the average distance the light traveled:

Or, in scientific notation:

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