Earth is also known as the “blue planet”, since around 70% of its surface is covered by water. No other planet in our solar system can be compared to Earth, although the oceans and lakes around the globe are not the only sources of water in the solar system. However, most of the non-earthly water is frozen. For example, the polar caps on Mars and some Jupiter moons are covered by ice, and on Jupiter’s moon Europe there are even indications of oceans under the ice. Furthermore, there are lots of comets traveling through the galaxy and they consist mostly of ice and, according to the latest findings, exactly such comets may be responsible that there is water on earth – and therefore also life.
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