Milky Seas
Milky seas, also called mareel, is a luminous phenomenon in the ocean in which large areas of seawater appear to glow translucently. Such occurrences glow brightly enough at night to be visible from satellites orbiting Earth. Mariners and other seafarers have reported that the ocean often emits a visible glow which extends for miles at night. In 2005, scientists announced that for the first time, they had obtained photographic evidence of this glow. It is most likely caused by bioluminescence.
Earth's "Milky Seas" (a luminescent nautical phenomenon) have been found in satellite data, and subsequently corroborated by sailors, for the first time. For centuries, sailors have told tales of nights when their ships would come across tens to hundreds of miles of seas that glow the color of milk.