Constellation, Starfish Under Ultraviolet Light, Edmonds, Washington
Several spicules on a mottled star (Evasterias troschelii) appear to glow bright yellow when viewed under ultraviolet light during an exceptionally low tide in Edmonds, Washington. The spicules are spines that protect the sea star from predators. The vibrant colors are the result of fluorescence, a type of photoluminescence, in which certain chemicals absorb light that is invisible to human eyes and emit some of it at a different wavelength that we can see. This scene was captured under black light.
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