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It’s less dense than water, which has led many people to postulate that it would float.ĭespite their size, the Jovian planets have low densities because of their gaseous composition. Jupiter is the largest planet in the solar system, but it’s Saturn-the solar system’s second largest planet-that takes the prize for least dense. Surprisingly, it is the trace gases in the Jovian atmospheres - not the hydrogen or helium - that give the planets’ clouds their color. o If a planet and a moon have identical densities, then the Roche limit is 2.446 times the radius of the planet. Within the Roche limit, a satellite is torn apart. Despite their size, the Jovian planets have low densities because of their gaseous composition. o The Roche limit is where the tidal force of a planet balances the self-gravity of a satellite orbiting the planet.
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