Roentgenium

Roentgenium is a synthetic and highly radioactive element created solely through human-made nuclear reactions, with virtually no natural presence or relevance in astronomical contexts. Its artificial production makes roentgenium exceptionally rare beyond Earth, contributing to its minimal astronomical significance. Roentgenium's isotopes have extremely short half-lives, typically lasting from milliseconds to minutes, further emphasizing 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.