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Mars Sample Return (MSR) remains a major uncertainty in the budget. The 2025 budget proposal includes more than $2.7 billion for planetary science overall but lists only “TBD” for MSR as the agency awaits the results of an architecture review for the program. That review is scheduled to be completed by the end of March, Nelson said in the call.
“We will report in April what then would be the spending in ’24 and ’25,” he said. “That’s why there is not a figure there in ’25.”
However, all of the planetary science funding included in the budget request is already allocated to other programs. “We’ll have to make some pretty tough choices,” said Nicola Fox, associate administrator for science. “We have to maintain a balanced portfolio overall.” She added that she did not expect the overall planetary science budget to go up once funding is allocated for MSR.