If they're planning on Mars orbit, and not a Mars flyby there's a propulsion system. edit: Unless by Mars orbit, he means, a solar orbit similar to the orbit o

If they're planning on Mars orbit, and not a Mars flyby there's a propulsion system. edit: Unless by Mars orbit, he means, a solar orbit similar to the orbit of Mars. Which actually probably is what he means. It's just the right blend of technically correct, but slightly misleading.