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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The Traveler made it a GARDEN world, and had capabilities of giving each and every celestial body within the Sol system an atmosphere of its own. It had the powers to make jungles on VENUS, which currently in real life is a gas, volcanic deathtrap. Originally you would be right, as Even going near Mercury would burn a human lifeform. But in the sense of the story and the power of the Traveler, anything is possible.