The National Aeronautics and Space Administration (NASA) Headquarters, has released a solicitation, titled "NASA Innovative Advanced Concepts (NIAC) Phase I," as an Appendix to the Space Technology Mission Directorate (STMD) NASA Research Announcement (NRA), titled "Space Technology REsearch, Development, Demonstration, and Infusion - 2024 (SpaceTech-REDDI-2024)," on June 03, 2024.Complete details (to include due dates) can be accessed via the following steps:1. Open the NSPIRES homepage at https://nspires.nasaprs.com/2. Select "Solicitations"3. Select "Open Solicitations" 4. Select "Space Technology Research, Development, Demonstration, and Infusion - 2024 (SpaceTech-REDDI-2024) NNH24ZTR001N"5. Select "List of Open Program Elements"6. Select "NASA Innovative Advanced Concepts (NIAC) Phase I, NNH24ZTR001N-25NIAC_A1"7. Select "NIAC Phase I Solicitation Document" under Announcement DocumentsThe NASA Innovative Advanced Concepts (NIAC) Program supports innovative research through Phase I, Phase II, and Phase III awards. This Phase I appendix solicits proposals for studying visionary, yet credible, advanced concepts in the NIAC Program. There are two steps to the Phase I proposal process; a brief Step A proposal open to all applicants, and an expanded Step B for those who are invited. The Step A proposal is due on July 01, 2024 (5:00 PM Eastern) and the Step B proposal (by invitation only) is due on September 19, 2024 (Target), 5:00 PM Eastern.This is an Open Announcement. All categories of U.S. organizations may apply. Non-U.S. organizations may partner in, or lead, NIAC studies on a no-exchange of funds basis, and subject to NASAs policy on foreign participation (see Section 3.5 of the REDDI NRA for additional information).All proposals must be submitted electronically through NSPIRES by an authorized organizational representative (AOR). Detailed submission instructions are provided in the SpaceTech-REDDI-2024 NRA, as well as the NASA Proposers Guide. Potential proposers and their proposing organizations are urged to familiarize themselves with the submission system, ensure they are registered in NSPIRES, and submit the required proposal materials well in advance of the deadline.Any updates to this Appendix will be posted on the NASA Solicitation and Proposal Integrated Review and Evaluation System (NSPIRES) page for this Appendix (https://nspires.nasaprs.com/external/). Offerors are encouraged to regularly refer to this website for updates and other information relative to this Appendix. Proposers are encouraged to submit their questions regarding this Appendix to hq- niac@mail.nasa.gov.Interested proposers should monitor the NSPIRES website or subscribe to the electronic notification system there for release of the SpaceTech-REDDI-2024 Appendices.Technical, programmatic, and procurement comments and questions may be addressed by e-mail to hq- niac@mail.nasa.gov. Responses to inquiries will be answered by e-mail and may also be included in the Frequently Asked Questions (FAQ) document located on the NSPIRES page associated with the Appendix; anonymity of persons/institutions who submit questions will be preserved.