Meitnerium

Meitnerium is a synthetic and highly radioactive element created exclusively through human-made nuclear reactions, with negligible presence or significance in natural astronomical contexts. Its synthetic production renders meitnerium exceptionally rare beyond Earth, leading to minimal astronomical relevance. Meitnerium'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 confined primarily to controlled laboratory conditions, such as in nuclear reactors or as a byproduct of nuclear processes.