What kind of planet is Jupiter?
AnswerA gas giant
Jupiter has no solid surface like Earth; it is a huge ball of gas and liquid.
Science · Facts & stats
Jupiter facts & stats
7 fact-checked facts about the planet Jupiter, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is Jupiter's Great Red Spot?
AnswerA giant storm
The Great Red Spot is a huge, long-lived anticyclone that astronomers have watched for well over 150 years.
Going deeper
Who discovered Jupiter's four largest moons in 1610?
AnswerGalileo Galilei
Galileo spotted Io, Europa, Ganymede and Callisto with his telescope; they are called the Galilean moons.
Which of Jupiter's moons is the largest moon in the solar system?
AnswerGanymede
Ganymede is bigger than the planet Mercury, though less massive.
Jupiter is made mostly of which two elements?
AnswerHydrogen and helium
Like the Sun, Jupiter is mostly hydrogen with a large share of helium.
Expert level
About how many Earth years does Jupiter take to orbit the Sun once?
AnswerAbout 12
Jupiter's orbital period is about 11.9 Earth years.
Which spacecraft discovered Jupiter's faint ring system in 1979?
AnswerVoyager 1
Voyager 1 imaged Jupiter's thin, dusty rings during its 1979 flyby.
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