#27 Planet Mercury normally keeps a low profile, but let's take a closer look at the first planet from the sun.

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We don't get to hear much about planet Mercury. It took us a long time to learn much about it and only two spacecraft have ever been there.
Let's take a look at some of the little known but fascinating facts about Mercury's history, why it has the longest day in the solar system and what we've learned from lonely pair of spacecraft that have visited it.  

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