Program News and Announcements

27 October 2021

Two Astrophysics Explorer Solicitations Amended To Extend Mandatory NOI Due Date

NASA’s Science Mission Directorate (SMD) is releasing two amendments for Astrophysics Explorers Science Investigations:

• Astrophysics Medium Explorer (MIDEX) Announcement of Opportunity (NNH21ZDA018O): Amendment 1


• 2021 Astrophysics Explorers Mission of Opportunity (MO) Program Element Appendix Q (PEA-Q) (NNH17ZDA004O-APEXMO2): Amendment 21 to the NASA Third Stand Alone Missions of Opportunity Notice (SALMON-3) Announcement of Opportunity.

These amendments extend the due date for the mandatory Notices of Intent (NOI) from proposers to either or both Announcements of Opportunity, which are now due by 4 November 2021 at 11:59p Eastern/10:59p Central/9:59p Mountain/8:59p Pacific. The proposal due date for both solicitations remains unchanged at 9 December 2021.

Comments and questions may be addressed by email to the Astrophysics Explorers Program Scientist, Dr. Linda S. Sparke, at linda.s.sparke@nasa.gov (with subject line "Astrophysics Explorers MIDEX AO" or "Astrophysics Explorers MO PEA" as appropriate).

Responses to all inquiries will be given by email and will also be posted at the Questions and Answers (QAs) location of the Astrophysics Explorers Program Acquisition website. The period for questions/comments will close three weeks before the proposal due date, and the period for responses will close 10 days before the proposal due date. Anonymity of persons/institutions who submit questions will be preserved.