The way physics work in our universe tends to lock planets and whatnot into orbits, and since our spot of the universe has been around for a while now these orbits have "all" been tested and found not to coincide with each other.
It is possible that we one day would encounter a rogue planet drifting through the universe that could be headed for a collision with one of "our" planets.
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Planets orbit the sun on specific paths due to gravity, which keeps them moving in their own orbits without colliding with each other. The vast distances between planets and the vastness of space mean that collisions are rare. Additionally, the gravitational effects of each planet on the other help to stabilize their orbits and prevent collisions.
Gravity, mainly. The Sun attracts the planets, and - to a lesser degree - the planets attract one another.
because the moon has an orbit that goes around the earth which is a path that the moon takes so it will not bump into any other planets
Another name for inner planets is terrestrial planets. These are the planets that are closer to the Sun and have rocky surfaces.
It means between planets, or from one planet to another.
It is highly unlikely for planets to form on another planet. Planets typically form from material surrounding a star, not from existing planets. However, moons can form around planets through processes such as accretion or capture.