Bid guide
How to bid on the 2026 Astrophysics Small Explorer (APSMEX) with NASA
What NASA is buying and why it matters
NASA is seeking proposals for its 2026 Astrophysics Small Explorer (APSMEX) program. This program funds space science missions, offering an opportunity for organizations to contribute to significant scientific discoveries and advancements in astrophysics.
This is a Request for Proposals (RFP) for professional services related to developing and executing space science missions.
Key dates and what happens at the deadline
The solicitation was published on June 09, 2026. The final deadline for full proposals is September 09, 2026, at 11:59 PM ET. However, a mandatory Notice of Intent (NOI) must be submitted before the full proposal deadline. The official announcement on the NASA NSPIRES website contains all specific dates, including the NOI deadline and details for a virtual Preproposal conference.
Missing the mandatory Notice of Intent deadline will prevent you from submitting a full proposal. All proposals must be submitted by the final deadline to be considered.
Who this opportunity suits
This opportunity is suitable for organizations with expertise in astrophysics, space science, mission development, and related professional services. It targets firms capable of proposing and executing complex space science missions.
The relevant category for this solicitation is professional services, specifically within the scientific and technical fields related to space exploration.
How to respond
To access the full details and respond, you must first visit the NASA Solicitation and Proposal Integrated Review and Evaluation System (NSPIRES) website. The final text for the Announcement of Opportunity (AO) 2026 Astrophysics Small Explorer (APSMEX) will be available there.
On the NSPIRES site, click on “Solicitations” and then enter the number “NNH26ZDA011O” in the search box. It is your responsibility to regularly monitor NSPIRES for any amendments or updates. You must also read the attached PDF file named “9JuneEmail.pdf” which contains other important dates, including the mandatory Notice of Intent submission and a virtual Preproposal conference. After reviewing the full AO, direct any comments and questions via email to both the primary and alternative points of contact listed, using “APSMEX26” in the subject line.
Tips for preparing a competitive response
Start early to thoroughly understand all requirements outlined in the Announcement of Opportunity. Pay close attention to the mandatory Notice of Intent and ensure it is submitted on time, as this is a prerequisite for submitting a full proposal.
Attend the virtual Preproposal conference mentioned in the “9JuneEmail.pdf” attachment. This is an excellent opportunity to clarify any ambiguities and gain insights directly from NASA. Craft your proposal to clearly demonstrate your organization's technical capabilities, relevant experience, and understanding of NASA's astrophysics goals. Ensure all sections of your proposal are complete, accurate, and directly address the evaluation criteria.
See the live bid — deadline, agency details, and how to respond
Dates and requirements can change via addenda; always verify on the bid page and at the original source before responding.
View this bid on BiddingSimpleThis guide was prepared by BiddingSimple from the solicitation’s public posting. It is not official guidance from National Aeronautics and Space Administration; the original posting controls.