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Currently HAT-P-1 is the largest planet ever discovered. Its a gas giant with a diameter 2.8x of Jupiter's. Its also the least dense planet found. Its only 1/4 the density of water making the planet its self lighter than a cork. Like Saturn it can float in water only it would float 3x highers. It's gravity is believed to be so strong that no rocky core. The planet its self completely changes the way how gas giants are believed formed.

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14y ago
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10y ago

We call it "Earth".

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Q: What is the name of the largest of the terrestrial planets by mass?
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