via Nasa

To honor the 50th anniversary of Earth Day and he 20th anniversary of NASA's Earth Observatory, the agency asked the public to pick our all-time best image on Earth. After five a five-round tournament and more than 56,000 votes, the readers chose Ocean Sand, Bahamas as their favorite.

We've posted 16 of the other top entrants. You can see the complete tournament results at Earth Observatory.

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