The global distribution of all experimentally known atomic spectral lines shows an uncanny resemblance to the Planckian spectral distribution associated with black body radiation at a temperature of T = 9000 K, as shown by Alexander Szameit and co‐workers in article number 2000033. This value coincides with the critical temperature of equilibrium between the respective densities of radiation and matter in the early universe.

中文翻译：

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黑体辐射：早期宇宙中原子光谱线的分布与辐射-物质-平衡之间的可能联系（物理年刊6/2020）

实验上已知的所有原子光谱线的全局分布都与温度为T = 9000 K时黑体辐射相关的普朗克光谱分布有着极为相似的变化，这由Alexander Szameit及其同事在商品编号2000033中显示。在早期宇宙中，辐射和物质各自的密度之间达到平衡的临界温度。