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  • “Exploration is in our nature.” - Carl Sagan

Below is a list of selected NASA science missions facing severe budget cuts or termination in the upcoming fiscal year.

These proposals are from the White House and are not supported by Congress, which retains ultimate authority over government spending decisions. But until Congress finalizes spending legislation, these projects remain in a period of significant programmatic uncertainty.

To help assess if these projects are avoiding premature funding disruptions during this period, The Planetary Society provides detailed data tracking financial expenditures on each project, comparing them to the prior fiscal year for context. NASA funding is flat between the current and prior fiscal year. As such, we should expect the expenditures to be roughly similar. Deviation between the two years, while not conclusive, may suggest that a project is experiencing premature financial consequences prior to congressional approval. Further investigation would be warranted.

The data are sourced from USASpending, the authoritative source for U.S. government spending information. Spending data is reported around the middle of each month, and generally lags two months behind the current date.

Compton spectrometer and imager cosi FY2026 Cancellation Threat Compton Spectrometer and Imager
Gold graphic FY2026 Cancellation Threat Global-scale Observations of the Limb and Disk (GOLD)
Ibex illustration FY2026 Cancellation Threat Interstellar Boundary Explorer
James webb space telescope l2 FY2026 Budget Cut Threat James Webb Space Telescope
20150727 PIA13746 FY2026 Cancellation Threat Juno
Artist depiction of mms spacecraft FY2026 Cancellation Threat Magnetospheric Multiscale Mission (MMS)
Maven artist concept mars arrival FY2026 Cancellation Threat Mars Atmosphere & Volatile EvolutioN (MAVEN)
20150727 2001 mars odyssey wizja FY2026 Cancellation Threat Mars Odyssey
Perseverance selfie cheyava falls FY2026 Budget Cut Threat Mars Perseverance Rover
Nancy grace roman space telescope FY2026 Budget Cut Threat Nancy Grace Roman Space Telescope
New horizons pluto charon FY2026 Cancellation Threat New Horizons
Orbiting carbon observatory 2 FY2026 Cancellation Threat Orbiting Carbon Observatory-2 (OCO-2)
Osiris apex at apophis FY2026 Cancellation Threat Origins, Spectral Interpretation, Resource Identification, Security - Apophis Explorer (OSIRIS-APEX)