It is estimated that the Solar System is 4.6 billion years old including Earth and the other planets.
Because it comes from other planets and earth is approx the same age as the other planets so they work it out bye the dust and how hot it is I think.
That's the age of our Solar System, so you can expect all the planets in our Solar System to have approximately that age.
Mainly size, density, distance from other planets, distance from the nearest star, existence of satellites, age, shape, (The Earth is flattened on its poles.) and many other features.
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.
Astronomers have found Earth-sized planets in other solar systems.
No, other planets are rotating at other speeds.
rotate
Earth's scientist have not found life on other planets to date.
Studying the earth helps scientists to understand other planets since the earth is part of the solar system. Scientists use the features of the earth to compare them with what other planets hold.
well some planets are bigger than the earth but from the inside earth is of course bigger than all of the other planets