NASA announced Monday it is dramatically overhauling its highly anticipated but troubled mission to bring pieces of Mars to Earth, a move that experts say puts the project on life support. The space agency said it continues to support Mars Sample Return, but will operate the program under bare-bones budgets in the near-term while it seeks proposals for a faster and cheaper mission architecture.

The mission is an ambitious attempt to secure pristine chunks of the Red Planet that might help scientists reveal whether it ever hosted life. But the future of the project has been uncertain since last fall, when an independent review board produced a dire report saying the mission needed a management overhaul amid probable cost overruns and delays.

A 2020 report from the board had estimated sample return would cost $3.8 billion to $4.4 billion. Now the estimated cost over the lifetime of the mission is between $8.4 billion and $10.9 billion, with samples arriving on Earth in 2040.

That would put Mars Sample Returns price tag similar to that of the James Webb Space Telescope, a scientific and engineering marvel now observing the universe from a solar orbit about a million miles from Earth. The Webb took decades to get off the ground and gobbled up more of NASAs science dollars than anyone had hoped.

The estimated 2040 return date is unacceptable, NASA administrator Bill Nelson said Monday in a news briefing.

Its the decade of the 2040s that were going to be landing astronauts on Mars. Its also unacceptable that its $11 billion, Nelson said.

The costliness of Mars Sample Return comes at a time when NASAs science budget isnt sufficient to fund all the telescopes and space probes already underway or being planned. With congressional support for the mission unclear, NASAs Jet Propulsion Laboratory earlier this year laid off about 8 percent of its workforce.

Still, Mars Sample Return has been the top priority of the planetary science communitys decadal survey process, which elevates the most promising missions from the blizzard of proposals. But retrieving pristine scraps of Mars for laboratory analysis on Earth requires unprecedented technological feats. NASA and its partners, including the European Space Agency, cant simply send a spacecraft to the surface of Mars and expect it to blast off again and return to Earth. Instead, the mission calls for a fleet of spaceships operating as a team.

The Perseverance rover, which landed on Mars in 2021, has been collecting and storing samples of Martian rock and soil in Jezero Crater, where scientists believe a river flowed into a lake several billion years ago. The rover has separate funding from the sample return project.

I think its fair to say we are committed to retrieving the samples that are there, Nelson said.

The original plan called for NASA to send another vehicle to land on Mars and collect the samples from Perseverance. That lander will carry an ascent vehicle that will blast off Mars and carry the samples to orbit. There the material will be transferred to yet another spacecraft, a Mars orbiter built by the European Space Agency and charged with the task of hauling the samples back to Earth.

At the briefing, NASA officials called on the scientific community and industry to propose new ideas that use more existing, proven technologies and possibly a simpler process to retrieve the samples.

We are looking at out-of-the-box possibilities that could return the samples earlier and at a lower cost, NASAs head of science Nicola Nicky Fox said during the briefing.

G. Scott Hubbard, a Stanford professor who formerly led NASAs Mars program, said in an email he was pleased by the robust drumbeat of support for the mission expressed by Fox and other officials in a NASA town hall Monday. But he questioned whether a new architecture could bring down costs and speed up the mission.

[A] magic-wand solution that dramatically reduces cost or schedule without substantially increasing risk is hard to imagine, Hubbard said. I would be happy to be proven wrong.

Bethany Ehlmann, a planetary scientist at Caltech and president of the Planetary Society, said NASA needs to find the willpower to finish a job already started by Perseverance.

I am confident that we have the technological pieces to put sample return together. But when we choose to do things that are hard, we need to decide to do them and overcome the challenges together, Ehlmann said. What we need is the leadership and the commitment to do it.

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NASA announces major overhaul of ambitious Mars Sample Return mission - The Washington Post