Mercury is the fastest planet in the solar system, racing around the Sun once every 88 Earth days. That is its year. Its day, counted the way we count ours, from one sunrise to the next, is far longer. According to NASA, “one Mercury solar day (one full day-night cycle) equals 176 Earth days,” which is just over two complete Mercury years. Read that again, because it inverts the usual relationship between a day and a year. On Earth a year holds …
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