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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A few problems with your theory First we do go to Mercury in crucible Secondly the traveler changed the planets to the point that life could be sustained Third real life sciences don't apply because the traveler revealed our theories of the universe to be wrong and shone light on a golden age of new knowledge. Fourth Space magic :) I could see Mercury being added in the second comet DLC in future.