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Cross of Hubble Space Center Sign the crossbow the sign of the son of man Center Sign Cross Hubble Space of

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Europa: Planetary scientists generally think that a layer of liquid water swirls around beneath Europa's surface, and that heat from tidal flexing causes the subsurface ocean to remain liquid. It is estimated that the outer crust of solid ice is about 6 to 19 miles thick, including a ductile "warm ice" layer that hints that the liquid ocean underneath may be 60 miles deep. This means that Europa's oceans would amount to slightly more than two times the volume of Earth's oceans.



A moon is defined as a natural satellite that orbits a larger body--such as a planet--that, in turn, orbits a star. The moon is kept in its position both by the gravity of the object that it circles, as well as by its own gravity. Some planets are orbited by moons; some are not. Some dwarf planets--such as Pluto--possess moons. In fact, one of Pluto's moons, named Charon, is almost half the size of Pluto itself, and some planetary scientists think that Charon is really a chunk of Pluto that was torn off in a disastrous collision with another object very long ago. In addition, some asteroids are also known to be orbited by very small moons.



Indeed, the mixture of nitrogen and methane that whirl around in Titan's swirling thick golden-orange atmosphere create a variety of organic compounds. It has been suggested that the heaviest materials float down to the surface of this hydrocarbon-slashed moon. When these organic compounds tumble down into Titan's lakes and seas--either by raining down from the clouds in alien showers of hydrocarbons, or by traveling along with Titan's strange rivers--some are dissolved in the liquid methane. The compounds that manage to survive this ordeal, and do not dissolve (such as nitrites and benzene), float down to the alien sea floors of this oddball moon-world.