In 1958, General Atomics proposed an unconventional spacecraft called Orion, designed to be propelled by a series of atomic bombs. The concept was developed by top physicists and was based on calculations that suggested it could outperform traditional chemical rockets. The spacecraft would eject nuclear charges from its rear, allowing them to explode at a distance. A specially designed thrust plate, mounted on shock absorbers, would absorb the shock waves from each explosion, converting them into forward motion. The Orion design included a crew compartment and payload area above the propulsion system, with space for up to 900 nuclear charges stored internally, and the potential for more externally. A thin steel disk with a central hole was used to spread anti-ablation oil, which helped protect the plate from damage between explosions. In 1959, a smaller-scale version of the Orion spacecraft called "Hot Rod" was built and tested at Point Loma, California. This test model used conventional explosives instead of nuclear charges to validate the propulsion concept. Five rapid, successive explosions sent shock waves against a reinforced thrust plate, propelling the model forward. After the test, the vehicle was successfully recovered using a parachute and remained intact. This test confirmed that a properly cushioned thrust plate could endure repeated explosions without breaking apart, providing a critical proof of concept for the larger Orion project. The Orion project aimed to revolutionize space travel, with engineers envisioning missions to Mars within a few months, rather than the several years required by conventional rockets. The high thrust and efficiency of the system made it possible to imagine sending large, inhabited expeditions to Mars as early as 1964 and even exploring Saturn’s moons by 1970. More ambitious variations, like "Super Orion," were theorized to be capable of carrying the equivalent of a small city into space. These plans were based on the belief that the propulsion system could provide unprecedented speed and payload capacity. However, the project was ultimately halted by the 1963 Partial Test Ban Treaty, which prohibited nuclear explosions in space. This treaty was intended to reduce radioactive fallout from nuclear testing. Since the Orion spacecraft would have required detonating dozens or even hundreds of nuclear charges, it fell under the treaty’s restrictions, making the system illegal. The declassified records show that NASA abandoned the project in the mid-1960s. While the concept was briefly revisited in the late 1990s under the name of external pulsed plasma propulsion, it never led to a large-scale program. The Hot Rod prototype, the largest surviving piece of the Orion project, was donated to the Smithsonian Institution in 1972 by Gulf General Atomic. It remains in storage, a quiet reminder of a spacecraft that once promised to transform how humans explore the solar system. Though the dream of Orion was never realized, its bold vision continues to inspire discussions about the future of space propulsion and exploration.