On July 9, 1962, the United States conducted a high-altitude nuclear test called Starfish Prime, detonating a thermonuclear device 400 kilometers above the Pacific Ocean. This test, part of a series of nuclear experiments, aimed to study the effects of a nuclear explosion in space on communications, radar systems, and the surrounding environment. The blast, equivalent to 1.4 megatons of TNT, was so powerful that it caused electrical disruptions thousands of kilometers away, including in Hawaii, where lights flickered and some systems temporarily failed. Just one day after the Starfish Prime test, the first commercial telecommunications satellite, Telstar 1, was launched. However, by November 23, 1962, it had stopped functioning. The cause was radiation from the nuclear test, which damaged the satellite's transistors. The explosion had created an artificial radiation belt around Earth, a region of charged particles that remained for several years. This belt affected numerous satellites, including Ariel 1, Explorer 14, and others, causing issues such as damaged solar panels and failed electronic circuits. The unintended consequences of Starfish Prime, which disrupted both military and civilian satellite operations, sparked international concern. The event highlighted the risks of nuclear testing in space and its potential to harm global communications and technology. In response, the United States and the Soviet Union signed the Partial Test Ban Treaty in 1963, which banned nuclear tests in the atmosphere, underwater, and in outer space. This treaty was directly influenced by the lessons learned from the Starfish Prime test. The test revealed the immense power of a high-altitude electromagnetic pulse (EMP), a burst of energy that can disrupt electronic systems over a wide area. It also underscored the vulnerability of the space environment to human-made disturbances. The artificial radiation belt created by Starfish Prime had long-term effects on satellite design and operations. Today, the test remains a key case study for aerospace engineers, reminding them of the risks associated with high-altitude nuclear detonations and the importance of protecting space-based technology from such threats.