On the Moon from the Earth (distance 3.8 x 10 ^ 5 km), objects 200 km long can be distinguished with the naked eye.

On the Moon from the Earth (distance 3.8 x 10 ^ 5 km), objects 200 km long can be distinguished with the naked eye. Determine what size objects will be visible on Mars with the naked eye from a distance of 10 ^ 6 km.

r1 / r2 = D1 / D2, r1 = 200 * 10 ^ 6 / 3.8 * 10 ^ 5 = 530 km

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