Nihonium

Nihonium is a synthetic and highly radioactive element generated exclusively through human-made nuclear reactions, with minimal natural presence or relevance in astronomical contexts. Its artificial production renders nihonium exceptionally rare beyond Earth, contributing to its negligible astronomical significance. Nihonium's isotopes have extremely short half-lives, typically lasting from milliseconds to minutes, further accentuating its absence in celestial bodies or cosmic environments. Its existence is primarily confined to controlled laboratory conditions, notably in nuclear reactors or as a byproduct of nuclear processes.