What's so special about our solar system's smallest planet?
Briefly

Imagine a planet without seasons, where two years pass in three days and light never reaches the poles; where surface temperatures are high enough to melt lead and low enough to freeze methane. But above all, imagine what it would be like to contemplate a sunset in which the Sun plunges into the horizon to go backwards a moment later, as if someone had pressed the rewind button, and a day or two later disappear in the western twilight.
The planet rotates very slowly, which is why its days and nights are so long; one day on Mercury is equivalent to 58.6 Earth days. Its year, which lasts 88 Earth days, is very short as it is the closest planet to the Sun. Its rotation period is not synchronized with its orbital period, as happens in the case of the Moon, but both periods are similar, in what we know as a 3:2 resonant orbit.
Read at english.elpais.com
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