Radon

Radon maintains negligible astronomical significance due to its properties and rare occurrence within celestial realms. Unlike other elements, radon, being a radioactive noble gas, is not typically produced through nucleosynthesis processes within stars and does not naturally exist in stellar environments. Its presence in cosmic settings is notably limited, primarily due to its short half-life and rapid radioactive decay, leading to its swift transformation into other elements upon formation. Consequently, the spectral characteristics of radon in astronomical observations are nearly non-existent, hampering its detection and study in cosmic environments.