New details of the Trump administration’s plans for NASA, released Friday, revealed the White House’s desire to end the development of an experimental nuclear thermal rocket engine that could have shown a new way of exploring the Solar System.
Trump’s NASA budget request is rife with spending cuts. Overall, the White House proposes reducing NASA’s budget by about 24 percent, from $24.8 billion this year to $18.8 billion in fiscal year 2026. In previous stories, Ars has covered many of the programs impacted by the proposed cuts, which would cancel the Space Launch System rocket and Orion spacecraft and terminate numerous robotic science missions, including the Mars Sample Return, probes to Venus, and future space telescopes.
Instead, the leftover funding for NASA’s human exploration program would go toward supporting commercial projects to land on the Moon and Mars.
NASA’s initiatives to pioneer next-generation space technologies are also hit hard in the White House’s budget proposal. If the Trump administration gets its way, NASA’s Space Technology Mission Directorate, or STMD, will see its budget cut nearly in half, from $1.1 billion to $568 million.
Trump’s budget request isn’t final. Both Republican-controlled houses of Congress will write their own versions of the NASA budget, which must be reconciled before going to the White House for President Trump’s signature.
“The budget reduces Space Technology by approximately half, including eliminating failing space propulsion projects,” the White House wrote in an initial overview of the NASA budget request released May 2. “The reductions also scale back or eliminate technology projects that are not needed by NASA or are better suited to private sector research and development.”
Breathing fire
Last week, the White House and NASA put a finer point on these “failing space propulsion projects.”
“This budget provides no funding for Nuclear Thermal Propulsion and Nuclear Electric Propulsion projects,” officials wrote in a technical supplement released Friday detailing Trump’s NASA budget proposal. “These efforts are costly investments, would take many years to develop, and have not been identified as the propulsion mode for deep space missions. The nuclear propulsion projects are terminated to achieve cost savings and because there are other nearer-term propulsion alternatives for Mars transit.”
