Sergio Sacani is a Brazilian astronomer and science communicator known for explaining space events in clear, enthusiastic Portuguese. The word sensational became closely associated with his excited reactions, especially when he discusses striking astronomical phenomena such as eclipses. Shared widely by Portuguese-speaking viewers, the short clip turned into a handy reaction sound for moments of awe and admiration. It remains popular because Sacani's delivery is instantly recognisable, warm, and easy to reuse whenever a creator wants a genuine, upbeat response to something impressive.