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Which elements make up most of Jupiter?
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Jupiter
Photograph of Jupiter taken by Voyager 1 on February 1, 1979, at a range of 32.7 million km (20.3 million miles). Prominent are the planet's pastel-shaded cloud bands and Great Red Spot (lower centre).
Jupiter is composed almost entirely of two elements: hydrogen and helium.3
Hydrogen is the most abundant element, constituting at least 70 percent of the planet by mass. While the atmosphere contains trace amounts of other substances—such as methane, ammonia, and water—these represent only a very small fraction of the planet's total composition.12