Starfish Prime was a high-altitude nuclear test conducted on July 9, 1962 as part of a group of tests collectively known as Operation Fishbowl. While Starfish Prime was not the first high-altitude test, it was the largest nuclear test ever conducted by the United States in space. The test led to the discovery and understanding of the nuclear electromagnetic pulse (EMP) effect and a mapping of seasonal mixing rates of tropical and polar air masses. Key Takeaways: Starfish Prime Starfish Prime was a high-altitude nuclear test conducted by the United States on July 9, 1962. It was part of Operation...