The name Mercury has gotten attached to a lot of things--an element, a car company, a WNBA team--but the OG is the planet closest to the sun, named after the Roman god. This hot, barren, lifeless (or so we think) world may not seem like it' has much going for it, but it's secretly fascinating. CONTENT WARNING: If you're a planetary scientist who had something to do with booting Pluto, this will be an uncomfortable five minutes for you.

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