The statement that could be added because it accurately describes our solar system in the Milky Way is:
"Our solar system will always be part of the Milky Way."
This statement is accurate because our solar system is gravitationally bound to the Milky Way galaxy and will remain a part of it as long as it exists. The other statements are incorrect or misleading. For example, our solar system is not located on the center bulge of the Milky Way, it is not the only one with a star at its center (as many solar systems have stars), and while there are many systems that may have habitable planets, the exact number is uncertain and not necessarily close to a billion.