As yet we are not certain as to the origins of Earth's water.
Earth, there are other planets out there that may contain water, but probably don't contain about 70 percent of water.
None. Galaxies on the other hand do contain planets
Earth is the planet with approximately 71% of its surface covered by water.
The other planets do have gravity.
Since no one from Earth has visited another planet, and we have no indication that there is anyone on the other planets, Earth does not help other planets in any way. Why do you think there is something Earth does to help them- whoever them is.
Earth and the other planets are mostly made of rock.
Humans only source their food from living matter. We eat only vegetable or animal matter. At present, no planets other than Earth are known to contain living matter.
Astronomers have found Earth-sized planets in other solar systems.
No, other planets are rotating at other speeds.
where did you hear that? it isnt
It is estimated that the Solar System is 4.6 billion years old including Earth and the other planets.
rotate