as follows: 70504. Steppingstone approach to exploration (a) In general The Administrator, in sustainable steps, may conduct missions to intermediate destinations, such as the Moon, in accordance with section 20302(b), and on a timetable determined by the availability of funding, in order to achieve the objective of human exploration of Mars specified in section 202(b)(5) of the National Aeronautics and Space Administration Authorization Act of 2010 ( 42 U.S.C. 18312(b)(5) ), if the Administrator— (1) determines that each such mission demonstrates or advances a technology or operational concept that will enable human missions to Mars