Habitable Worlds Observatory Instrument Concept Assessments (NNH25ZDA001N-HWOICA)

Amendment #1 (09/03/2026): This Amendment adds the "2ndEmail" attachment which summarizes the following changes under ROSES-2025 Amendment 73: Section 3.3.2 has been updated regarding Collaborators on Category 2 proposals. It now allows that unfunded U.S.-based individuals involved in the proposed work may be included as Collaborators. New text is in bold in the ROSES Amendment 73. The due date remains unchanged: Proposals are due by October 14, 2026. In addition, the FAQ has also been updated. NASA will accept questions up until September 18, 2026. The attached PDF file labeled “1stEmail” is text that the NASA Solicitation and Proposal Integrated Review and Evaluation System (NSPIRES) sent…