'N': On March 4, 2009, the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite captured this image of ship tracks over the Pacific (pictured). Ship emissions contain small particles that cause the clouds to form. By the time Voiland compiled his gallery of natural art, he had become a new dad and noted he was 'deep into a Dr. Seuss reading phase with my son'
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