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Something just occurred to me: When they take photos of the outer planets such as jupiter, saturn, or neptune (or pluto, fight me) one major problem is that there isn't actually much light. The sun at that distance is effectively a particularly bright star, not the powerful source of light we're used to here on Earth. We're talking single digit percentages of the amount of light we get here, and by neptune or pluto we're talking fractions of a percent.