; and (B) the expected goals and achievements in the following 2-year period. (3) Submission with budget Each human exploration roadmap under this section shall be included in the budget for that fiscal year transmitted to Congress under section 1105(a) of title 31. III ADVANCING SPACE SCIENCE 71731. Policy on maintaining balanced space science portfolio It is the policy of the United States to ensure, to the extent practicable, a steady cadence of large, medium, and small science missions. 71732. Mission priorities for planetary science (a) In General In accordance with the priorities established in the most recent Planetary Science Decadal Survey, the Administrator shall ensure, to the greatest extent practicable, the completion of a balanced set of Discovery, New Frontiers, and Flagship missions at the cadence recommended by the most recent Planetary Science Decadal Survey. (b) Mission Priority Adjustments Consistent with the set of missions described in subsection (a), and while maintaining the continuity of scientific data and steady development of capabilities and technologies, the Administrator may seek, if necessary, adjustments to mission priorities, schedule, and scope in light of changing budget projections. 71733. Extrasolar planet exploration strategy (a) Strategy (1) In general The Administrator shall enter into an arrangement with the National Academies to develop a science strategy for the study and exploration of extrasolar planets, including the use of the Transiting Exoplanet Survey Satellite, the James Webb Space Telescope, a potential Wide-Field Infrared Survey Telescope mission, or any other telescope, spacecraft, or instrument, as appropriate. (2) Requirements The strategy shall— (A) outline key scientific questions; (B) identify the most promising research in the field; (C) indicate the extent to which the mission priorities in existing decadal surveys address the key extrasolar planet research and exploration goals