Neoteny . This is a term in developmental biology applied to any juvenile trait that is retained into adulthood. Consider the axolotl, an amphibian that retains its larval external gills into maturity; similarly, think of the relatively hairless skin of adult humans – unlike other apes, retained from infancy. And like the domestic dog, which retains its playful puppy stage throughout life, amateur astronomers are humans in a similar stage of behavioral arrest. They never lose the infantile wonder of the unknown that lesser mortals sadly lose as they get older. Astronomers are intelligently curious, because they are neotenous!