Saturn could float in water because it is mostly made of gas. Saturn spins on its axis very fast. A day on Saturn is 10 hours and 14 minutes. The Ringed Planet is so far away from the Sun that it receives much less sunlight than we do here on Earth.

Saturn has the lowest density of any planet, 0.7 g/cc, which is less than that of water. Saturn is of such low density that it would float in a (gigantic) bathtub.

The hydrogen in the atmosphere of Saturn pushes up – but not very much, it’s just not dense enough. That means this core will “fall” towards the surface of the water planet. The hydrogen atmosphere will then move up and probably become part of the water planet’s atmosphere.

Uranus and Neptune are mostly ice, and Saturn is mostly gas, so it’s less dense. Above Saturn’s mass, the gravity of the planet tends to increase its density, so Jupiter is more dense than Saturn. Planets more massive than Jupiter don’t get much larger than Jupiter; they just get more dense.

The male planets are Sun, Mars, Jupiter, and Saturn; Mercury and Uranus are neuter; Moon, Venus, Neptune, and Pluto are female (though Pluto is related to Mars despite its Dark Mother feminine archetype).

It can never leave that region. For all practical purposes the matter has disappeared from the universe. Once inside the black hole’s event horizon, matter will be torn apart into its smallest subatomic components and eventually be squeezed into the singularity.

Even though, at any given instant, there’s only around 10-22 kilograms of dark matter inside you, much larger amounts are constantly passing through you. Every second, you’ll experience about 2.5 × 10-16 kilograms of dark matter passing through your body.

So far, scientists have only observed indirect evidence of dark matter. A definitive, direct detection of dark matter particles has yet to be made. There are several theories to account for what that particle might be like. The most favoured one has been the WIMP, or Weakly Interacting Massive Particle.

The total mass of dark matter is fixed, so as the Universe expands and the volume increases, the density of dark matter drops, just like it does for normal matter. As new space gets created in the expanding Universe, the dark energy density remains constant.

Primary evidence for dark matter comes from calculations showing that many galaxies would fly apart, or that they would not have formed or would not move as they do, if they did not contain a large amount of unseen matter.