Gwedo: Walk the Moon & Mars

A Solar System trip in your hand. ■ Space flight Fly between the Sun, the planets and their major moons. Tap a planet or pick it on the route map and autopilot takes you there; a short card opens when you arrive. In free flight a tap guides you there too; move the stick to take over. Beside Earth floats the International Space Station, from NASA's detailed model; near Jupiter, Saturn, the Moon and Neptune you will find NASA's public 3D models of the spacecraft there (Juno, Cassini, LRO, Voyager 2), and "Look closer" flies you in on the Great Red Spot, Saturn's rings, Io's volcanoes and Europa's ice. ■ The Moon · Sea of Tranquility Walk a landing site rebuilt from records of the plain where Apollo 11 touched down in 1969. A slow, bounding gait tuned to lunar gravity (about one sixth of Earth's), the lander, Earth in the black sky, and five stops (the laser reflector, the flag, the…