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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Mercury was converted to a machine planet within days according to Ghost. It will happen. Mercury will be released as a Vex DLC. As hot as mercury is, the Vex may have Terra formed the entire planet. We don't know much detail as to how Bungie will release the story.