Astronomy Picture of the Day . Titan: Saturn's Smog Moon . ... Titan is the only one of Saturn's moons with an atmosphere, and one of only two moons in the Solar System with this distinction (Neptune's Triton is the other). ... Pictured, the second person to walk on the Moon: Edwin "Buzz" Aldrin. ... On July 20th, 1969, a human first set foot on the Moon. ... The Small Cloud of Magellan . ... The Magellanic Clouds are small irregular galaxies orbiting our own larger Milky Way spiral galaxy. ...