Americium

Americium is a synthetic, radioactive element that holds minimal relevance in astronomical contexts due to its human-made origin and extreme rarity in the universe. As an artificial element produced through nuclear reactions, particularly in nuclear reactors or as a byproduct of nuclear processes, americium is not naturally occurring in celestial bodies or cosmic environments. Its various isotopes have relatively short half-lives, ranging from hours to centuries, contributing to its scarcity beyond Earth.