Spectators were also holding “watch-the-bomb parties” in Hawaii, as the countdown was broadcast over shortwave radio.
https://api.nationalgeographic.com/distribution/public/amp/science/article/why-the-us-once-set-off-a-nuclear-bomb-in-space-called-starfish-prime
https://www.livescience.com/magneto-rotational-hypernova-explosion-detected.html
Known as a "magneto-rotational hypernova," this ancient explosion would have been roughly 10 times brighter and more energetic than a typical supernova (the violent death that awaits most stars in the universe, including Earth's sun), leaving behind a strange stew of elements that helped fuel the next generation of stars.