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Io and Jupiter

Jupiter (right) and its moon Io during a July 2023 flyby.
Jupiter (right) and its moon Io during a July 2023 flyby. Image: NASA/JPL-Caltech/SwRI/MSSS

From afar, you can’t tell that Io (at left) is covered in hundreds of volcanoes. But you also can’t tell that Jupiter’s opalescent streaks are actually turbulent clouds of gas. It makes the Jovian system seem almost…peaceful? Still, I wouldn’t recommend making a vacation out of it.