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The planets in our solar system come in two forms: Some are rocky, and some are gaseous. But all of the moons in our solar system are rocky, even the ones that orbit gas giants. So why aren’t some moons in the solar system made of gas? And are there gaseous moons anywhere in the universe?

There are some very good reasons why no nearby moons are gaseous. And while we haven’t found a gaseous moon beyond our solar system, it could be possible under the right conditions, said Jonathan Lunine, chair of the Department of Astronomy at Cornell University.

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