The Astrophysics Research and Analysis Program (APRA) program solicits basic research proposals for investigations that are relevant to NASA’s programs in astronomy and astrophysics and includes research over the entire range of photons, gravitational waves, and particle astrophysics. Awards may be for up to four years’ duration (up to five years for suborbital investigations), but shorter-term proposals are typical; four-year or five-year proposals must be well justified. Proposals for suborbital investigations are particularly encouraged. APRA investigations may advance technologies anywhere along the full
line of readiness levels, from Technology Readiness Level1 (TRL1) through TRL9. The emphasis of this solicitation is on technologies and investigations that advance NASA astrophysics missions and goals, including those missions being studied for the next decadal survey.

Amendment 50 makes a number of changes throughout Section 1.2, and in particular a new paragraph has been added to In addition, some of the points of contact have changed in the Summary Table of Key Information. New text is in bold, deleted text is struck
through. The due dates remain unchanged.

Michael R. Garcia

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