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By size, Jupiter reigns supreme in our solar system. This gas giant has 11 times the diameter of Earth. Astronomers have spotted even larger gas giants, such as the exoplanet Kepler-7b, located 1,400 light years away from Earth.
In our solar system, Jupiter and Saturn are gas giants. These planets make Earth look tiny. The diameter of Jupiter is 11 times bigger than that of Earth, and Saturn’s is nine times bigger. Some people also include Uranus and Neptune in the gas giant category. They have a lot of hydrogen and helium in their atmospheres. But these planets also have water, methane and ammonia, and so NASA places them in their own group.
Astronomers have spotted gas giants outside our solar system. Like Jupiter and Saturn, they aren’t very dense. But they can be even bigger or hotter than our solar system’s gas giants.
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