Saturn
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Saturn is the least dense of the gas giants, even out of all of the planets in our solar system. Its average density is around 0.7 g/cc (less than water)
Mass of Planet X divided by volume of Planet X
The planet with the least mass and smallest is Mercury. The planet with the lowest density is Saturn
Earth has the highest density, which is equal to 5.5153 g/cm3 However, if you remove gravitational compression the materials of which Mercury is made would be denser, with an uncompressed density of 5.3 g/cm3 versus Earth's 4.4 g/cm3
Mercury comes in 2nd place - average density (5.44 g/cm3 == ==
Mercury. Whilst it is not the most dense (Earth being the most dense planet of the Solar System), without gravitation compression on the Earth, Mercury would be the most dense. So if Earth was the same size as Mercury, Mercury would be the densest planet. It is also the smallest planet.
Saturn.
Mercury has the second lowest density of any planet in the solar system. Saturn has the lowest density of any other planet.
Mars is the least dense of the rocky planets.
Jupiter
The planet with the lowest overall density is Saturn.
Saturn has the lowest density of any planet, terrestial or gas giant.
The planet with the lowest density is Saturn at 687 kg/m3.
Saturn has the lowest density, but it has more than 31 moons.
Mercury is the smallest of the four inner planets and closest to the sun. It is also the smallest of all eight planets.
Jupiter has the largest atmosphere Saturn has the lowest density
All the gas giants; in our Solar System, Saturn has the lowest density (less than the density of water).
volume. This gives the average density of each planet, which varies depending on the planet's composition and structure.