Yea and there aren't cities on Mars or venus, it's sci-fi with space magic, Mercury could be habitable with the proper shielding. It's also a vex planet so they could've changed some shit. But whoever is saying Venus is hotter than Mercury is a damn fool. Edit: turns out I'm the damn fool, thanks ubn for providing facts, Venus is about 35 kelvin hotter than Mercury due to its atmosphere trapping the solar heat.