Dolphins use echolocation to create an impression of the world around them. These pictures hold a wealth of three-dimensional information like depth, making it difficult to translate into flat images.

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According to a Nov. 30 NASA photo description, the images that appear in the dolphin series were taken between 2:26 p.m. and 2:46 p.m. PDT (5:26 p.m. and 5:56 p.m. EDT) that day, from about 11,400 ...