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Explanation:

The phrase ‘leaving laundry hanging on a line downwind from a smokestack’ means that if clean clothes are hung out to dry in the downwind direction of a smokestack, they will become dirty because of pollution.
As per the third paragraph, the solar system is suffused with comet dust which is dark while Saturn’s rings are still bright.
If the rings were around for a long period of time, they would also become dark due to the absorption of the comet dust.
Thus only option 3 correctly explains the phrase ‘leaving laundry hanging on a line downwind from a smokestack’.
Hence, the correct answer is option 3.

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