We have been waiting for almost 50 years since that day on 16 July 1969 when we saw Armstrong, Aldrin and Collins walk down the ramp in their white spacesuits, headed for moon

The expensive SLS rocket, with current NASA budgets (about $19 billion yearly in constant dollars), will be available only once a year, not enough to support a Moon base or to land astronauts on Mars (as opposed to orbiting the planet). Under this pessimistic scenario, human exploration beyond LEO (Low-Earth Orbit) will be limited to lunar orbit flights without landings or a surface base.