Oganesson

Oganesson is a synthetic and highly radioactive element created exclusively through human-made nuclear reactions, possessing virtually no natural presence or relevance in astronomical contexts. Its artificial production makes oganesson exceedingly rare beyond Earth, contributing to its minimal astronomical significance. Oganesson'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 remains primarily confined to controlled laboratory conditions, such as in nuclear reactors or as a byproduct of nuclear processes.