Guys,
Mercury can't be in the game because it's the hottest planet in the solar system. It basically touches the Sun's CMEs and we would all be dead immediately due to radiation and heat. Why do people want to go to a molten rock and fight the vex? These things blow my mind.
Why do people keep saying VENUS is hotter than Mercury? You guys need to learn the order of the planets.
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Actually, there is a crucible map placed on Mercury. Obviously if you can do PvP on the map, you can do PvE. Either they didn't want us to have Mercury or they just haven't released it yet.