Different Worlds Author AlexPublished on February 29, 2016 Although Tethys and Janus both orbit Saturn and are both made of more or less the same materials, they are very different worlds. via NASA http://ift.tt/1RftqBR Share this:MastodonEmailLike this:Like Loading... Related posts: Mathematician Katherine Johnson at Work The Ice Fields of Patagonia Flying Through the Aurora’s Green Fog Hubble’s Blue Bubble