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Which planet is least dense?
Quick Answer
Saturn is the least dense planet, with an average density of about 0.69 grams per cubic centimeter. It is so light that, in theory, it would float in water.
The Full Story
Saturn's enormous size does not make it the densest planet; in fact, it is the least dense, at about 0.69 g/cm³. That is lower than the density of water, though the comparison is only theoretical because Saturn is a gas giant. Its low density comes from its composition of mostly hydrogen and helium. Saturn's structure makes it a striking example of how size and density are not the same thing.
Key Facts
1.Saturn's average density is about 0.69 g/cm³
2.It is the least dense planet
3.It is composed mostly of hydrogen and helium
YouTube Angle
Suggested video title for this topic:
"Saturn is so light, it could float in a giant bathtub."
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