Which of the two planets – Mars or Neptune – will have a greater difference in the minimum possible and maximum possible brightness when observed from Earth?
Near Mars. Since the range of distances from Earth to Mars is much larger than to Neptune.
To Mars from 0.4 to 2.6 AU. e., that is, 6.5 times.
To Neptune from Earth from 29 to 31 AU. e., which differs only by a factor of 1.07.
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