A rotation around the sun.
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.
All planets actually follow an elliptical orbit.
All of them in one way or another. This includes Earth.
Another name for the terrestrial planets is the inner planets. There are four terrestrial planets: Mercury, Venus, Earth and Mars.
The inner planets are also known as terrestrial planets. This term is used because they have solid rocky surfaces similar to Earth's.
I think you mean extrasolar planets. Technically, all planets except Earth are "extraterrestrial." At last report there were almost 900 of them, with more to follow. They aren't a "group" in the usual sense, just a category.
NO. All the planets are in (more or less) fixed orbits.
The earth is a planet, it has no known planets within.
There are no planets orbiting Earth.
Planets are all made of titanium. That later comes into play by reflecting the sun, and also magnetically pulling earth toward them. Scientist think that eventually, the Earth will become the moon of another planet.
"Orbit", as in " the Earth orbits the Sun". Another answer is "revolution".
The Solar System has two major groups of planets - the four inner planets which include Earth, and the four outer planets. Each of these groups shares certain characteristics with one another. Mainly, the outer planets are gas giant - i.e., they are much larger than Earth, and they are made up mainly of gas.