Astronomy › Section I · Giant planets, moons, and rings › Topic I.1
Exploring the outer planets
Almost everything we know up close about Jupiter, Saturn, Uranus and Neptune comes from a handful of robot spacecraft. Their journeys show what the giant planets are made of, and how hard it is to work billions of kilometres from home.
In this topic
- Where most of the planetary mass lives
- Gases, ices and rocks
- A hydrogen-rich chemistry
- Why distance makes exploration hard
- Worked example: talking to a distant spacecraft
- The pathfinders and the Grand Tour
- The orbiters: Galileo, Cassini and Juno
- Worked example: solar power at Jupiter
- Where the missions stand (as of late 2026)
- Common mistakes to avoid
- Key takeaways
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