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Europa
What NASA says: Astonishing geology and the potential to host the conditions for simple life make Jupiter's moon Europa a fascinating destination for future exploration. Beneath its icy surface, Europa is believed to conceal a global ocean of salty liquid water twice the volume of Earth's oceans. Tugging and flexing from Jupiter's gravity generates enough heat to keep the ocean from freezing. On Earth, wherever we find water, we find life. What will NASA's Europa mission find when it heads for this intriguing moon in the 2020s.
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Enceladus
What NASA says: The discovery of Enceladus' icy jets and their role in creating Saturn's E-ring is one of the top findings of the Cassini mission to Saturn. Further Cassini mission discoveries revealed strong evidence of a global ocean and the first signs of potential hydrothermal activity beyond Earth – making this tiny Saturnian moon one of the leading locations in the search for possible life beyond Earth.
What the designers say: Saturn's moon Enceladus is all about the plumes erupting from its south pole. At our first brainstorming session, someone called the plumes "Cold Faithful," and that helped crystallize this idea quite quickly. There's no right way up in space, so for fun, we turned the surface upside down from the point of view of the visitors in the picture.
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Ceres
What NASA says: Ceres is the closest dwarf planet to the Sun. It is the largest object in the main asteroid belt between Mars and Jupiter, with an equatorial diameter of about 965 kilometers. After being studied with telescopes for more than two centuries, Ceres became the first dwarf planet to be explored by a spacecraft, when NASA's Dawn probe arrived in orbit in March 2015. Dawn's ongoing detailed observations are revealing intriguing insights into the nature of this mysterious world of ice and rock.
What the designers say: The big sign in this poster is inspired by the gateway in Reno that announces it as "the biggest little city in the world." We kind of thought that might suit Ceres. It's the biggest object in the asteroid belt between Mars and Jupiter and probably has a lot of water ice underground. We designed all of these posters as a group, and liked the way this looked with a very muted color palette.
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And, finally: Earth
What NASA says: There's no place like home. Warm, wet and with an atmosphere that's just right, Earth is the only place we know of with life – and lots of it. JPL's Earth science missions monitor our home planet and how it's changing so it can continue to provide a safe haven as we reach deeper into the cosmos.