In fact, scientists believe that water is very common in the universe, although so far still only Earth has liquid water, but in many places in the solar system discovered ice.
In some science fiction movies, often alien to the Earth's purpose is to occupy our resources, the most common resource to the number of liquid water. In fact, scientists believe that water is very common in the universe, although so far still only Earth has liquid water, but in many places in the solar system discovered the ice and liquid water beneath the surface of many of the planet. Science fiction movie alien invasion of Earth Water will occupy, it seems they are not representative of the wisdom of the species, because according to current astronomical research, the water is not unique to the Earth's resources.
From the perspective of the solar system, comets and Kuiper Belt has frozen water exist nearby, from the Oort cloud to Mercury, Venus, in addition to outside, can be found in almost all traces of ice-cold water. Oort cloud farthest distance from the sun, there are also a lot of water ice on the comet material, as well as a variety of carbon and nitrogen compounds, comets approaching perihelion, these water ice begins to evaporate. Most comets are less than 10 kilometers, if you want to get a lot of water, you need to get and many other Kuiper Belt objects.
Not long ago, the Pluto system is also found water ice mass, scientists believe the presence of volatile substances Fengyun 2000 km diameter of Pluto's lithosphere layer, a few tens to hundreds of kilometers scientists believe the presence of the ocean depths beneath the surface of Pluto. From the inside of the track to observe Pluto, Neptune, Uranus, Saturn and Jupiter is a giant planet in the solar system, has a very high pressure in the interior depths, scientists think they have the equivalent of several Earth water resources in the kernel to hydrogen and helium layer.
Europa is a typical planets have subsurface ocean, scientists have found some evidence icy satellite Fengyun exist within the ocean, but the ocean on Europa may slightly alkaline, all quite tasty. Mercury Arctic ice is also potentially have substance, there is also the presence of ice on Mars, today gully on Mars traces from ancient ocean. Scientists also found water on Mars may also salty. In addition to the Earth, the solar system is almost all over water resources, mainly in the frozen state mainly, of course, be able to maintain liquid water planet, only one planet.
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