Scott Bolton’s first encounter with Io took place in the summer of 1980, right after he graduated from college and started a job at NASA. The Voyager 1 spacecraft had flown past this moon of Jupiter .

On Jupiter, the majority of water rain and ammonia snow appears to cycle high up in the cold atmosphere and evaporate as it falls, Moeckel said. Yet, even before Juno’s arrival at Jupiter, de Pater ...

"That's what Chris is trying to explain with his storm systems going much deeper than we expected." Gas giants like Jupiter and Saturn ... representative of what is inside the planet," Moeckel ...

But these are not the planet's only celestial tag-alongs. Jupiter has dozens more—and there may still be more to find. In 2003 alone, astronomers identified 23 new moons.

Observations of Jupiter ... storm started -- carrying the ammonia with them. This helps explain why ammonia appears to be missing from the upper atmosphere: it's being dragged down and hidden deep ...