One image that really inspired me was shortly after I went to work for JPL in 1979, the Voyager spacecrafts discovered the active volcanoes on Jupiter's moon Io. These volcanoes are caused by the tidal heating and stresses on the moon due to its close orbit to the giant, massive planet.
This was the first time we had seen active volcanic activity anywhere other than Earth and it made the solar system a little more real to us!
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