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 teraformed Venus and mars. Probably altered the gravity on the moon or else gave us the technology to create artificial gravity in our gear. The vex turned mercury into a machine. Who's to say we would have to be playing on the surface? Also machines like the vex cannot withstand solar radiation or heat, so odds are they cooled it off and shielded it from the radiation...science!(fiction)