“inside the solar system”
If you mean within the orbits of the planets, that is not correct. Even if you mean as far away as the ends of the Oort Cloud which extends out about 2 light years and contains about 1 trillion cometary objects, that still may not be correct. See my comment #74 for an interesting source. Some comets may come in from outside the Oort Cloud.
That is my definition and is therefore apriori true.