" Well, Io is Mordor: Look up Part Three. There’s a passage about ‘rivers of molten rock that wound their way… until they cooled and lay like twisted dragon-shapes vomited from the tormented earth.’ That’s a perfect description: how did Tolkien know, a quarter century before anyone ever saw a picture of Io? Talk about Nature imitating Art. "

― Arthur C. Clarke , 2010: Odyssey Two