That seems like a good match for this nuclear sail concept: https://www.nasa.gov/general/thin-film-isotope-nuclear-engine-rocket/ https://www.nasa.gov/general/

That seems like a good match for this nuclear sail concept: https://www.nasa.gov/general/thin-film-isotope-nuclear-engine-rocket/ https://www.nasa.gov/general/thin-film-isotope-nuclear-engin... > The basic concept is to manufacture thin sheets of a radioactive isotope and directly use the momentum of its decay products to generate thrust. Actually it's mentioned at the end of the article: > Novel ability to reach deep space (> 150 AU) very quickly and then continue aggressive maneuvers (> 100 km/sec) for dim object search/rendezvous and/or retargeting telescopes at the solar gravitational focus over a period of years.