... Jupiter's Great Dark Spot . ... Credit: Cassini Imaging Team , Cassini Project , NASA Explanation: Seventeenth century astronomer Giovanni Domenico Cassini was an astute observer of Jupiter's Great Red Spot. So it seems only fitting that his namesake, the Cassini spacecraft, has enabled detailed observations of another planet-sized blemish -- Jupiter's Great Dark Spot . ... Publications with keywords: Jupiter - cassini spacecraft . Publications with words: Jupiter - cassini spacecraft . ...