AO Astrophysics Explorers Program 2026 SMEX Amended
The National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) announces the release of Amendment #1 to the Announcement of Opportunity (AO) to solicit Principal Investigator (PI)-led space science investigations for the Small Explorer (SMEX) opportunity. The post AO Astrophysics Explorers Program 2026 SMEX Amended appeared first on NASA Science .
NASA's Astrophysics Explorers Program 2026 SMEX Amendment #1 was released on August 10, 2026. The amendment, found on NSPIRES, outlines changes to the Announcement of Opportunity (AO) for space science investigations led by Principal Investigators (PIs). The proposal deadline remains September 9, 2026, unchanged. Detailed changes can be found by consulting Amendment #1 on NSPIRES, along with the updated Q&A document on the Science Office for Mission Assessments (SOMA) website.
Questions and comments about the 2026 Astrophysics SMEX AO should be directed to Dan Moses, Hannah Jang-Condell, or Omar Torres via email, using the subject line "APSMEX26".
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