2. Mercury

Mercury is the planet in the solar system that's situated the closest to the sun. Except for Pluto, which is a dwarf planet, it's also the smallest of the set. Named after the Roman Messenger God, Mercury, you might have seen or heard people mention Mercury being in retrograde. Or, as another variant, blaming it for things going on around them. When Mercury moves into retrograde, it means that the planet appears to be moving backward. This is actually just an illusion for those of us on Earth.

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