The Earth and the Neptune has Water that been discovered really interesting
Not yet, but, as we have discovered water on various planets and moon, the possibility of life - as we know it - does exist.
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Most planets that have been discovered are in the Milky Way
Most planets that have so far been discovered have had gaseous atmospheres.
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Most exoplanets so far discovered resemble Jupiter. However, Earth sized planets have also been discovered and more will be discovered.
No. He discovered great moons, which, had they not been orbiting planets might have been considered planets themselves, but the first new planet since antiquity was Uranus, discovered by Sir William Herschel.
Water in some form has been discovered on most if not all the solar planets. This is not terribly surprising, since water is composed of the two most common reactive elements in the universe. (Helium is more common than oxygen, but it is not reactive.)
as far as we know it is the only planet that has water and life
Yes. So far nearly 2,000 extrasolar planets have been discovered.
There may be ice on some planets that we haven't discovered yet. However, there is ice on Mars and once believed for there to be water.
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