Space was never far from Bowie’s thoughts. In a TV interview in 2000, he quipped: “Is there life on Mars? Yes, it has just landed here.” He meant the Internet, which he called “an alien life form.” Of course, pop culture’s supreme alien was Bowie himself. The most indelible of his alter-egos was the flame-haired extraterrestrial rock star Ziggy Stardust. He played another visitor from space — a kind of goth E.T. — in Nicolas Roeg’s cult-film classic The Man Who Fell to Earth. Even offstage, Bowie’s presence was otherworldly. Nina Simone, whom he befriended in the early ’70s, admiringly deemed him “not human.” “David ain’t from here,” she said.