Ten Years on Titan

Ten years ago today--Jan. 14, 2005--humanity reached out and touched another world. And it was a doozy. It was Titan, the largest moon of Saturn. The Cassini spacecraft, still on its way to entering orbit around the ringed planet, had already dropped a small probe named Huygens--named after Dutch astronomer Christiaan Huygens, who discovered Titan--to go their separate ways. Huygens was aimed at the monster moon (nearly as big as the planet Mercury!), and on Jan. 5 began its descent. Titan's at...