If we are to expand the exploration of our solar system, our next manned flight should be to Phobos, one of Mars' s moons, rather than to Mars itself  The flight times to each are the same, but the Phobos expedition would require less than half the fuel load of a Mars expedition and would, ttherefore, be much less costly
So, it is clear that Phobos should be our next step in space exploration
Lift-off for the return trip from Phobos requires much less fuel than that from Mars because of Phobos' weaker gravitational pull.