Circling high above the Earth, Landsat satellites have collected digital image photographs of the planet's continents and coastal areas. The Library of Congress has collected a number of these remarkable images (with the assistance of the United States Geological Survey) and visitors to this site can use the interactive features to zoom in and out on each image. The images have interesting titles, like "Empty Quarter", "Algerian Abstract", and "Ghostly Grease Ice". Each image can be sent as a postcard, and a brief paragraph or two describes the scene far below on the Earth's surface. Finally, visitor can also click on the "Learn More" tab to learn about additional web-based and print materials.