[Editorial] People will go to Mars. And they will go back to the moon, and to Europa, Titan, Vesta and many other interesting and exotic places in the solar system and beyond. It’s not a question of if, but when. We started down this inexorable path centuries ago, and the thirst for exploration still courses through our veins and resonates in our stories of the exploits of Ulysses, Columbus, Magellan, Cook, Hillary and, of course, Armstrong and Aldrin.