Europa and IO

New Horizons caught these two Jovian moons as they passed near each other. Europa is a calm, icy world; thought to perhaps be a possible home to alien life, as it likely has a massive ocean under it's surface. While Io is a volcanic moon, with gigantic and violent eruptions (one of which can be seen in the photo).

Source: http://www.ciclops.org/view/3957/Io_and_Europa_Meet_Again

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