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10 things massive enough to be seen from space

Dubai's World and Palm artificial islands

Photo: NASA

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Dubai's artificial islands

Consisting of sandy human-made islands two miles off the mainland of the Arabian emirate of Dubai, the World development (at right) and the Palm Islands were built to resemble, you guessed it, a world map and a palm tree. Visible from space, these landforms were made using sand dredged from the shallow waters of the Persian Gulf. There is even a plan to add a replica of the solar system with the sun, stars and planets called the “Universe” to the human-made geography of Dubai.