NASA
Space Reactor 1 Freedom
The “first nuclear-powered interplanetary spacecraft” has very well-defined objectives: finding water and literally scouting out the ground for larger spaceships that will one day carry humans.
NASA will even move forward with Skyfall missiona concept that envisions sending three small helicopters to Mars in 2028, using a unprecedented propulsion technology on an interplanetary mission: nuclear electric propulsion.
The US agency describes the vehicle that will carry the mission, the Space Reactor-1 Freedom, as the “first nuclear-powered interplanetary spacecraft”.
The announcement was made on the 24th and was communicated as a new step in NASA’s strategy for future long-term exploration in deep space. Unlike radioisotope thermoelectric generators (RTG), used for decades to power probe instruments like Voyager, nuclear electric propulsion is not just for producing onboard electricity. In this system, explains , a fission reactor generates thermal energy, which is converted into electricity to power high-efficiency electrical thrusters.
According to NASA, this technology could become decisive for robotic missions to the outer solar system, for supporting a future lunar base under the Artemis program and, later, for human travel to Mars.
Although the Skyfall mission stands out for sending a small air fleet to the red planet, the central element could be precisely the Space Reactor-1 Freedom. According to the agency, this spacecraft will allow testing nuclear hardware in flight, establishing regulatory and launch precedents, and accelerating the industrial development of fission systems applied to propulsion and surface exploration.
Skyfall helicopters will be similar to the device that arrived on Mars with the Perseverance rover in February 2021 and which became the first helicopter to fly on another world. Between April 2021 and January 2024, Ingenuity performed 72 flights. But, unlike this technological demonstrator, the new devices will have concrete scientific and operational objectives.
Equipped with cameras and ground-penetrating radar, the helicopters must assess the potential of the target zone for future human missions. Among the planned tasks is the identification of slopes and risks for landing larger vehiclesas well as the mapping and characterization of underground water ice depositsincluding its location, depth and size.
If the schedule holds, the mission will be launched in December 2028 and should reach Mars about a year later. NASA also admits that the Space Reactor-1 Freedom can continue operating on other missions after releasing the helicopters, although the final architecture of the project is not yet finalized.
