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Which planet is the least dense?
Quick Answer
Saturn is the least dense planet, with an average density of about 0.69 g/cm³. It is less dense than water.
The Full Story
Saturn has the lowest average density of any planet in the Solar System. Its mean density is about 0.69 grams per cubic centimeter, which is lower than the density of water. That means if there were a bathtub large enough, Saturn would float in it, though it would break apart long before that could happen. Its low density is due to its composition, mostly hydrogen and helium.
Key Facts
1.Average density about 0.69 g/cm³
2.Less dense than water
3.Second-largest planet by mass and size
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Suggested video title for this topic:
"The planet so light it would float in water!"
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