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Mars Sample Return science continues amid budget uncertainty

March 16, 2024
in Science
Mars Sample Return science continues amid budget uncertainty
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THE WOODLANDS, Texas — Efforts by scientists to use a Mars rover to collect samples are continuing even as NASA wraps up a new assessment of when and how those samples will be brought back to Earth.

The Perseverance rover, which landed on Mars in February 2021, has filled 26 of its 43 sample tubes, scientists involved with the mission said in presentations at the Lunar and Planetary Sciences Conference (LPSC) here March 12. The rover is climbing up the remains of a river delta that once flowed into Jezero Crater.

Of those 26 tubes, 20 contain rock cores, said Meenakshi Wadhwa, a planetary scientist at Arizona State University who serves as principal scientist for Mars Sample Return (MSR) at the Jet Propulsion Laboratory. Two contain regolith and another holds a sample of the atmosphere, while the other three are “witness tubes” that serve as controls to identify any terrestrial contamination in the other tubes.

Two of the remaining 17 tubes are also witness tubes, leaving 15 that can be filled with other samples. Scientists are planning next phases of the rover’s traverse, she said, such as to the crater rim, which promises what she called “an incredible diversity” of rocks of different ages and exposed to different processes, “including materials of astrobiological potential.”

That work is ongoing as NASA enters the final phases of a review of the overall MSR architecture, including the schedule and design of the mission that will collect those sample tubes and return them to Earth. After an independent review board, or IRB, concluded that the agency’s existing approach could not meet cost and schedule goals, NASA commissioned an MSR IRB Response Team (MIRT) in October to evaluate alternative approaches.

“Much of the work is already complete” by the MIRT, Wadhwa said. The MIRT is expected to complete its work by the end of the month, with NASA releasing its revised MSR plans, and proposed budget, as soon as April.

That has put not just MSR but also NASA’s overall planetary science portfolio in limbo. NASA’s fiscal year 2025 budget proposal, released March 11, left MSR funding as TBD, or to be determined. At the same time, the agency must also develop an operating plan for fiscal year 2024 funding provided by an appropriations bill passed March 8 that instructed NASA to spend at least $300 million, and as much as $949.3 million, on MSR in 2024.

The TBD in the fiscal year 2025 budget request for MSR reflects the uncertainty about the plans for carrying out the program, said Lori Glaze, director of NASA’s planetary science division, during a town hall meeting at LPSC March 11. “We’re trying to give the response team the time they need to complete their assessment and provide the recommendation,” she explained.

Once that work is done, NASA will amend its budget request to seek specific funding for MSR in 2025, but at the expense of the allocations requested for other planetary programs in the original proposal. “I do not expect the top level of the planetary budget to go up above the $2.73 billion” in the original request, she said, which is already fully allocated to other programs. “We need to think about how we support Mars Sample Return within a balanced planetary portfolio and within that $2.73 billion top line.”

NASA faces similar challenges for determining MSR funding in 2024 within the limits set by the appropriations bill. “This is going to be the heart of a very difficult process,” she said.

While providing little information about what the new MSR architecture, and its cost and schedule, will be, NASA officials at the conference reemphasized the scientific value of the program.

“Mars Sample Return is one of the highest priorities in the past two decadal surveys. It is an agency priority,” said Lindsay Hays, acting lead scientist for MSR at NASA Headquarters, during a March 12 presentation. The samples, she said, can serve as a “Rosetta Stone” to decode the early history of terrestrial planets.

Those officials acknowledged, though, the uncertainty about MSR was affecting science planning. That includes potential surveys beyond the crater rim by Perseverance to collect samples. “We’re awaiting to see what the MIRT results are,” Hays said. “The MIRT is going to help us understand what is our future architecture and future schedule.”

She added that “maximizing sample number and simple diversity is absolutely key” for the mission, a point Wadhwa also made.

“We are currently awaiting the outcome of the MIRT in terms of what the timeline is going to look like,” Wadhwa said, which will shape what kind of traverse Perseverance will take to collect additional samples at and beyond the crater rim. “We have an amazing set of rocks awaiting us in those regions.”

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