see: https://www.cnrs.fr/en/discovery-30-exocomets-young-planetary-system?fbclid=IwAR39yaj5xf36z2KK_d8lwZKweL1vRGLIk74gkxFyeMsQbY_POJtXKUt0GT8
but also: https://vixra.org/author/leo_vuyk
Small new Penrose-Q-FFF black holes ( smaller comets) are needed to make this propulsion.