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10 things massive enough to be seen from space

By: Josh Lew on Jan. 17, 2014, 10:44 a.m.
Great Barrier Reef as seen from space

Photo: NASA

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Great Barrier Reef

Known as the largest living structure on Earth (it is made entirely of coral), the Great Barrier Reef sits in shallow water off the coast of Eastern Australia. At over 1,600 miles long and with a total area of around 130,000 square miles, it is easy to see why this unique geographical feature is a favorite photo-op for satellites. While its endless coral formations and over 1,500 species of fish make it worth an up-close look, to appreciate the full scope of this aquatic landscape, you have to look at satellite images, which show it stretched parallel to the entire coast of northeastern Australia.