EARTH South Atlantic Ocean -- 29 Apr 2009 -- It took the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite a full five minutes to fly over this expansive cloud pattern.

EARTH South Atlantic Ocean -- 29 Apr 2009 -- It took the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite a full five minutes to fly over this expansive cloud pattern. The sprawling 'S'-shaped swirl is actually two cyclones that seem to be feeding on each other. Polar cyclones often form as a result of low-pressure systems over the ocean, and usually bring winds and heavy snow. MODIS acquired this photo-like image over the cold waters of the South Atlantic Ocean, where winter is approaching. The image has been rotated, so that north is toward the left. The spot of green in the upper left corner of the image is coastal water off the southern tip of Africa. A north-up oriented image is available in a variety of resolutions from the MODIS Rapid Response System -- Picture by Lightroom Photos / NASA