Question: (a) How long does it takes for light to reach the earth from Mars when the separation of the two planets is at its smallest?

(a) How long does it takes for light to reach the earth from Mars when the separation of the two planets is at its smallest? The earth’s orbital radius is 143 million kilometers. The orbital radius of Mars is 218 million kilometers.
(b) How long does it take when the separation is at its maximum? Assume the planetary orbits are circular. Also, make the (nonphysical) assumption that the sun is transparent to the transmission of light between the planets.

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