Saturn is less dense than water, so in theory it would float.

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Saturn global view from Cassini, rings open Better Colour
Space

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Saturn is less dense than water, so in theory it would float.

Saturn’s average density is lower than liquid water’s, which motivates the floating comparison. A planet-sized bathtub is not a physically realistic experiment, so this is a density analogy rather than a literal prediction.

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Venus from Mariner 10
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243 days

A rotation on Venus takes longer than its entire year.

Venus takes about 243 Earth days to rotate relative to the stars, longer than its 225-day year. Its solar day, measured from one sunrise to the next, is shorter: about 117 Earth days.

Moving heart of the Crab Nebula
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1B tons

A teaspoon of neutron star would weigh about a billion tons.

A teaspoon-sized volume at neutron-star densities can have a mass of roughly a billion tons. This is a density comparison, not a suggestion that stable spoonfuls could be brought to Earth.

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