The White House’s FY 2027 budget request for NASA would eliminate nearly half of NASA’s science fleet. The Planetary Society has identified 53 missions* across all major science divisions that would be terminated. You can view the list of missions here.

The budget request itself attempts to conceal these terminations. Instead of explicitly zeroing out a mission's funding line, the FY 2027 budget subtly omits any mention of terminated missions. 

The only way to identify which science missions are proposed for termination is to compare programs line by line against prior-year budget documents and note which missions are missing from FY 2027.

The Planetary Society compiled this list based on our review of the budget documents in FY 2027, FY 2026, and FY 2025.

* This number was revised down, as we had incorrectly counted the TROPICS mission, which re-entered Earth's atmosphere in November of 2025. 

In a letter to House and Senate Appropriations Committee leadership, a group of 13 former NASA astronauts urged Congress reject proposed cuts to NASA, warning that "cuts of this magnitude would surrender the future of space exploration to other nations willing to embrace the challenge and reap the rewards of global leadership." The signatories includes former NASA Administrator Charlie Bolden, former NASA Associate Administrator for Science Dr. John Grunsfeld. The collective spaceflight experience of the signatories is more than 647 days in space. The letter text can be found here.

The impactful letter comes as the White House Office of Management & Budget released a budget proposal that would slash the NASA budget by more than 23%, halve agency science funding, completely eliminate STEM engagement programs, and shut down more than 40 missions. 

Former NASA Chief of Staff and Congressman George Whitesides (California's 27th District) issued a statement in response to the release of the FY 2027 budget request.

In the statement, Congressman Whitesides indicated that the OMB-drafted request is "dead on arrival" in Congress, citing the overwhelming bipartisan support for NASA's mission of exploration and discovery in the FY 2026 budget. 

NASA's full budget request document, known as the congressional justification, was released just hours after the OMB posted their "skinny" budget. Typically, this document comes out days or even weeks. 

Initial analysis shows the document lacking in significant details, including spending information for fiscal years 2025 and 2026 which is often provided to the public by these documents. There are few mentions of Administrator Isaacman's Ignition plans like the Moon Base, Space Reactor-1, and an accelerated Artemis Program. And the document makes the assumption that Congress had enacted last year's budget proposal, which did not happen. This inadequate document underscores how out of touch OMB is from the reality of space policy in 2026.

Stay tuned for updates about specific mission cancellations and other insights.

The Office of Management & Budget has officially released the FY 2027 "skinny" budget request, known as such because it only provides top-level details. More details are expected later in April, but the proposal looks shockingly familiar so far: 47% cut to NASA Science, elimination of the Office of STEM Engagement, cancellation of 40 or more space missions, and a retreat from deep space exploration ambitions.

Meanwhile, NASA is flying astronauts to the Moon for the first time in 50 years, major space projects are being constructed, and Administrator Isaacman has laid out an ambitious path forward for space science and exploration.

Take action now by writing your representatives and urge them to reject the cuts, just as they did in January.

The White House will share details of its fiscal year 2027 spending proposal for the U.S. government. We expect to see top-line NASA numbers, and possibly directorate-level values shared today. The Office of Management and Budget has already posted some highlights.

The release of the budget request kicks off the appropriations process in the U.S. Congress, which ultimately decides on spending allocations to NASA programs.

Late in the afternoon on Friday, January 23, President Trump signed H.R. 6938, providing $24.4 billion for NASA and $8.75 billion for NSF through September 30, 2026. Next, the agencies will submit plans to Congress to detail how they plan to spend their budgets. But for now, advocates can breathe a sigh of relief knowing that their hard-won victory on federal space science spending is now law.