The atmosphere of Saturn is 96 percent hydrogen and three percent helium. But just how much water exists on, in, and above our planet? Saturn is the only planet of the Solar System that is less dense than water—about 30% less. About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Now, it’s time for the main attraction. Orbit and Spin Saturn's atmosphere, although similar to Jupiter's, is much less interesting to look at from a … Like Jupiter, Saturn rotates extremely fast, and completes a rotation in about 10 hours. tiger stripe regions close to the south pole. ADVERTISEMENT Saturn is thought to be the solar system’s windiest planet. Earth’s density, on the other hand, is about 550 percent that of water, and Jupiter’s is about 130 percent. With this amount of water being expelled, vapors can get through to Saturn regardless of some being lost in space, or falling to other Saturn moons, and freezing on Saturn's rings. With only about 70 percent the density of water on average, the planet would float if it could be placed in water. And, these ice chunks can be the size of sand grains, to as big as a typical building. orbits in the opposite direction to Neptune's rotation. The primary reason you moved to the sixth planet from the Sun, it’s rings. Saturn has a very low density and its gravity is not that much different than Earth’s, so I imagine you would initially free fall similar to how you would on Earth. It takes a little over 29 years to make one revolution around the Sun. Saturn's specific gravity is less than water's, meaning it would float on a body of water! The exact relative abundance of the two molecules is not well known, since helium must be measured indirectly. Saturn’s atmosphere is composed mostly of molecular hydrogen and helium. On Saturn's moon Enceladus, fountains of ice particles and water vapor are seen to be spraying out of. In fact, it has a density that’s only a little higher than water. It all comes down to density.The density of Uranus is the second least in the Solar System, after Saturn. Water is composed of two hydrogen (H) atoms and one oxygen atom, H 2 O. The upper clouds in Saturn’s atmosphere are composed of ammonia while the lower layer clouds are composed of ammonium hydrosulfide or water. Neptune's moon Triton. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog. Currently the best estimate is that the planet’s atmosphere is 18 to 25 percent helium by mass. Although Saturn's core is considerably denser than water, the average specific density of the planet is 0.69 g/cm 3 due to the atmosphere. Saturn has the lowest mean density of any of the planets. That water then surrounds the planet at a distance of about four radii, and computer models indicate that three to five percent of it falls down on Saturn. Jupiter has 318 times Earth's mass, and Saturn is 95 times Earth's mass. What would it be like to fall into the surface of Saturn? The Earth is a watery place. Saturn is approximately 75% hydrogen and 25% helium with traces of other substances like methane and water ice. The multiple rings are composed almost entirely of water ice chunks. Viewing Saturn’s Infamous Rings. If it could be placed in water the surface of Saturn 2.. On, in, and Saturn is approximately 75 % hydrogen and three percent helium on a body water... Is approximately 75 % hydrogen and 25 % helium with traces of substances. Molecules is not well known, since helium must be measured indirectly currently the best estimate is that planet... Particles and water ice chunks 25 % helium with traces of other substances like methane and water.. 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