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Contains maps of the universe zooming out from the nearest stars to the entire visible universe.
Infoplease is the world's largest free reference site. Encyclopedia, Dictionary, Almanacs, and Homework Help on English, math, history, geography, science, and social studies.
The National Geographic Word Atlas for 2013 is currently available as a free iPad app. I recommend grabbing it while it’s free. The app features a globe that students can rotate, zoom-in, and...