ANSWERS: 2
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It is constantly changing as Mars orbits the Sun at a different speed to the Earth. However, it's average orbit is 230 million km from the Sun and the Earths is 150 million kilometers, so the closest it would ever pass using these averages is about 80 million km. However, this assumes that the Earth would catch up to Mars in it's orbit whilst both are at the average distance from the Sun.
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It's not far at all. You go down past the moon, then you'll see Macy's and the Asteroid bowling alley, then go through the circle about 15 millennia and then there's this light.
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