MNN Galleries

NASA's space tourism posters will make you want to explore the galaxy

By: Michael Graham Richard on Feb. 12, 2016, 5 p.m.
Beneath an icy surface, Europa is believed to have an ocean of salty liquid water twice the volume of Earth's oceans.

Photo: NASA/JPL

9 of 15

Europa: Discover life under the ice

The sixth moon of Jupiter was discovered in 1610 by Galileo Galilei and named not after Europe the continent, but after the Greek mythological figure.

NASA's poster caption reads: “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?”