Saturn's largest moon, Titan, is the only moon in the solar system with a substantial atmosphere. #NASA is working on sending a submarine into space to explore its methane seas: http://cnn.it/1LiC7KD | CNN

20 years ago today, ESA's Huygens probe gave us jaw-dropping views of the surface of Saturn's hazy moon, Titan, as it became the first probe to land on a world in the outer solar system. Descending through the thick yellow atmosphere for about three hours, it revealed surprisingly Earth-like landforms. ▶️ Extract of video by ESA/NASA/JPL/University of Arizona built from Huygens probe data. Visit https://science.nasa.gov/resource/a-view-from-huygens/ to watch the full video. | NASA History