I think a wandering planet struck the planet between Mars and Jupiter and destroyed the planet with most of the planets’ became the asteroid belt and the rest became comets and meteors.
This article may interest you. It looks like two, maybe 3 recent meteors/comets and maybe interstellar iron found in Australia and Antarctica came out of the interstellar cloud we’re cruising through now. Voyager 1 found ‘weak but persistent’ plasma waves locked to a certain frequency. Maybe the local asteroid belt isn’t the only thing shooting rocks at us!