This one may require a little web-crawling, although the title practically gives

Question

This one may require a little web-crawling, although the title practically gives it away. Assume there are two planets in Earth's orbit; our own dear home, and a planet that's identical in every way except that it has no atmosphere. Even though rotation rates are the same, the sun appears to set slightly earlier on the airless planet.
(We're talking actual sunset times, not the length of twilight. Obviously, the airless planet wouldn't have a twilight. Why? Explain the difference in sunset times.

Explanation / Answer

For that matter, Earth itself would not exist: our planet appears to have ... there is nothing magical about the formation of "new" elements, though it almost seems so. ... in an atom is always the same, meaning that the atom has no electric charge. ... Radioactive decay is one of two ways that one element can become another.

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