Tennessine

Tennessine is a synthetic and highly radioactive element produced exclusively through human-made nuclear reactions, holding negligible natural presence or relevance in astronomical contexts. Its artificial creation renders tennessine exceedingly rare beyond Earth, leading to minimal astronomical significance. Tennessine's isotopes exhibit extremely short half-lives, typically lasting from milliseconds to minutes, further accentuating its absence in celestial bodies or cosmic environments. Its existence remains primarily confined to controlled laboratory conditions, notably in nuclear reactors or as a byproduct of nuclear processes.