+**D15** refers to a celestial classification used to categorize certain distant astronomical objects. These enigmatic bodies often present unique [spectral signatures](/wiki/Spectral_Signature), providing crucial data about the early universe. Their study helps refine models of [galactic evolution](/wiki/Galactic_Evolution).
+## See also
+- [Star](/wiki/Star)
+- [Galaxy](/wiki/Galaxy)
+- [Astronomy](/wiki/Astronomy)