According to the second theory, the planets Earth, Mars, Venus, and Mercury were so close to the center of the solar system that most of the water on those planets evaporated due to heat. Only a small amount of water remained between their rocks. Shortly after the Earth formed, it collided violently with a large asteroid, and part of the Earth exploded as an asteroid. There, the world is losing more water. The Earth now has more water than any other planet, which is said to have been hit by a large number of icy asteroids that formed the oceans.