I looked to see if anything like this was asked, but can’t find.
So a star is formed, the sun for instance., and creates a gravitational force on its own. After a billion years a kuiper belt surrounds the sun in a very very distant gravitational orbit, like our own solar system. But somehow the gravity seeks out the largest asteroid, of rock and begins to pull it from the kipper belt slowly, I mean really slowly, toward the sun. Like our own solar system. After the largest rock is pulled in another rock or rocks is pulled in and slowly forms a large planet that smooths into a sphere over time. After another half billion years maybe, the planet is huge from absorbing all the matter floating around it. And also is closer to the star or sun it orbits. Of course another celestial body is being formed at the same time. A million or more miles behind it.
After a while comets have crashed into it to provide an atmosphere. And so this is a theory of the creation of life in the the solar system. But instead of having an end, or the star burning out, what happens is eventually the planet gets too close to the sun and the atmosphere is burned away and hurdled back into the freezing space to eventually re accumulate and form another comet. The planet that gets too close to the sun will eventually be absorbed by the sun and will create a special type of miniature supernova that may or may not reset most life at the next inhabited planet, perhaps a possible extinction method, ie. Dinosaurs. But will replenish the suns matter for fuel. Where a planet is turned into fission or fusion or whatever that is. Kind of like the movie “sunshine” but with a planet. Any way, in this world this is the pattern, almost perpetual, except for one problem, where do I get an endless supply of kuiper belt material? If the comets can move around by being burned off of planets or knocked off by collisions, and the matter, or planets, are turned into fuel eventually when it hits the sun, how do I replenish my kipper belt?
I could theorize that somehow the energy from the sun, or its photons, as neutrinos or something, has some kind of atomic weight to it that is lost if they crash into other elements or as it leaves the gravity of the sun and turns to stone. I guess that is a possibility. Any other ways?
Probably not a reliable source of matter to bring in from distant space. And the matter cannot just be endless