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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Perhaps the traveler created a magnetic field that was suitable enough to protect the atmosphere from being embraced by lethal solar winds... or perhaps the composition of the atmosphere allows the planet to deflect the sun rays just enough.