solar flare... sends out a blast of magnetic field, it has been known to cause power outages on the planet of Earth
It keeps them in orbit
The moon's effect on other planets is minimal compared to its influence on Earth. The moon's gravity can cause slight motions in the planets, but these effects are typically very small due to the planets' larger size and distance from the moon. Overall, the moon primarily affects Earth's tides and to a lesser extent, the movement of celestial bodies within our solar system.
In some cases, its because it's simply closer to the sun than other planets. In other cases, its because the Earth has an atmosphere that traps the heat in like the Greenhouse Effect purports.
the effect it has on other planets
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.
The existence of large objects like planets or stars curve space and time. As the Earth goes around the sun it is in fact falling into the sun. The problem is that the sun and other planets are also moving. Gravity from the sun's previous location takes time to reach the Earth and planets such that the gravity from another location reaches the targets first. As the Earth and other planets reach a location where it might be moving in; the sun moves again, and other planets impart their gravity as well. The gravity of the sun becomes diluted throughout the heliosheath because of this weakening the effect of gravity even further.
rotate
It is estimated that the Solar System is 4.6 billion years old including Earth and the other planets.