Darmstadtium
Darmstadtium is a synthetic and highly radioactive element synthesized exclusively through human-made nuclear reactions, holding minimal presence or significance in natural astronomical realms. Its artificial creation results in darmstadtium being exceedingly rare beyond Earth, contributing to its negligible astronomical relevance. Darmstadtium's isotopes exhibit extremely short half-lives, typically lasting from milliseconds to minutes, further emphasizing its absence in celestial bodies or cosmic environments. Its existence remains confined primarily to controlled laboratory conditions, such as in nuclear reactors or because of nuclear processes.