What the Night Sky on Mars may look like. The clearest sky any human has never stood under.Mars' atmosphere is barely 1% as thick as Earth's. So the stars don't twinkle. They just sit there, sharp and steady, burning cold and clear.No cities. No streetlights. No glow on the horizon. On a clear night, your eye could catch stars down to magnitude 6.6 — as deep as the human eye can physically go, something almost nobody on Earth ever gets to experience through all our light pollution.And then there