In addition, meteorites that land on the earth always carry a cat-like rock. Because the water needed to form these rocks, water on Earth may have come from rocks in space. So, based on these two proofs, the second theory is more likely. The inner rock planets of the solar system have very low water content compared to the lunar planets of the outer planets (Uranus, Saturn, Neptune, Jupiter). This shows that in the early days, the water from the inner planets evaporated and the water from the outer planets did not evaporate.