White House Works To Ground NASA Science Missions Before Congress Can Act

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Projects should prepare their plans assuming closeout direction is given on October 1, 2025, one of the NASA memos states. Missions in operations—that is to say, spacecraft whizzing around the Solar System conducting science right now—should "assume closeout is complete within 3 months."

The memos are careful to state that the preparation of these closeout plans is for the purposes of a "planning exercise only." However, multiple scientists familiar with the new directive from NASA's leadership do not believe these closeout plans are merely for planning purposes.

This includes some high-profile casualties, including NASA's only mission at Jupiter, an effort to explore an asteroid that will fly extremely close to Earth in 2029, two promising missions to Venus, and an effort to return samples from Mars.

"We would be turning off some fabulous missions that are doing extremely well," said Jim Green, a physicist who led NASA's Planetary Science Program for 12 years before his retirement in 2022.