1200 people on Mars for the cost of a few Apollo landings
The path forward is to use regenerative (breeding) of isotopes that emit more protons for positron emissions. This regenerative approach will enable full scale antimatter catalyzed deuterium fusion propulsion. The Deuterium fusion propulsion will be able to achieve performance like other deuterium fusion rocket designs which is up to 10% of lightspeed and 100K+ ISP to millions of ISP
Gregor J. Rothfuss 