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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I hope this is a troll. Venus is hotter because it's atmosphere is out of control greenhouse effect while mercury basically has no atmosphere. As for the lore of this game the traveler terraformed mercury into a garden world prior to vex invasion.