sending it in a rocket ship how else
Saturn's is.
Saturn is less dense than water. So the Answer is Saturn.
That Saturn's density is so low that it would float on water (if a big enough body of water were found).
Saturn!
Saturn has a density less than water, so it would float if there was a large enough container of water to hold it. Saturn is made mostly of hydrogen and helium, which are less dense than water.
Saturn is the planet with a density less than water. Its average density is about 0.687 g/cm^3, whereas the density of water is 1 g/cm^3. This low density is due to Saturn being mostly composed of hydrogen and helium gases.
Since Saturn has a mean density of 0.687 g/cm3, less than that of water, it is nice to think that it would float in water. While that is (sort of) true, you also have to consider that Saturn is much colder than the freezing point of water, so it would freeze whatever water it was placed in. Also, Saturn's core is much denser than water, so one would also have to consider what happens when the atmosphere of Saturn is boiled away by the temperature of the water. In the final analysis, it is moot, because the volume of water required to attempt to float Saturn would exceed the volume of Jupiter, and we just don't have that much water available.
It would be submerged in water.
Saturn's density is so low that it can even float on water, it has the less density in all solar objects.
SATURN.
Saturn. Obviously it's not a very practical idea, but Saturn is less dense than water.
Saturn is the only planet in our Solar System that is less dense than water. Saturn would float if there were a body of water large enough!♥♥