Space Reactor-1 Freedom would pioneer nuclear electric propulsion while delivering a trio of helicopters to Mars, but the estimated cost excludes the separate science mission expected to ride aboard the spacecraft.
WASHINGTON | NASA's ambitious effort to launch the world's first nuclear-powered spacecraft to Mars is expected to cost more than $2.1 billion, marking one of the agency's most significant investments in advanced deep-space propulsion as it balances competing priorities that include returning astronauts to the Moon and preparing for eventual human exploration of Mars.
The project—known as Space Reactor-1 (SR-1) Freedom—is designed to demonstrate nuclear electric propulsion (NEP) for the first time in space while transporting the SkyFall science mission to the Red Planet.
NASA confirmed this week that the spacecraft itself carries an early estimated cost of approximately $2.1 billion, though agency officials emphasized that figure remains subject to refinement as the acquisition process continues.Notably, the estimate does not include the cost of the SkyFall scientific payload, which some planetary researchers warn could place additional pressure on NASA's already constrained science budget.
Funding Spread Across Four Fiscal Years
According to budget documents submitted to Congress and reviewed by TELL IT LIKE IT IS News, NASA plans to finance the spacecraft through a combination of exploration funding and previously approved reconciliation legislation.
Current projected funding includes:
- FY 2026: $640 million
- FY 2027: $890 million
- FY 2028: $415 million
- FY 2029: $180 million
NASA officials say the agency is restructuring existing exploration resources rather than requesting major new appropriations for the program.
"We are realigning all the resources within the topline to make sure we can cover the items that were identified," agency officials said during recent budget discussions.





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