This has got to be a troll. In a game where the idea of "space magic" is simply accepted and most, if not all of the worlds in our solar system have been terraformed and made viable for human life, you believe The Traveler couldn't have done the same to Mercury? Not to mention that Venus IS hotter than Mercury. The atmosphere of Venus traps greenhouse gases and solar radiation better than that of Mercury, making it hotter. Learn your science, troll.