Via Starwars.com:

LEARN HOW THE PLANETS OF STAR WARS OFTEN SPEAK VOLUMES ABOUT THE THEMES AND DIRECTION OF THE SAGA.

In a galaxy far, far away, the battles between the forces of light and darkness have taken the heroes of Star Wars to a wide range of inhabited worlds. While some places, such as Tatooine and Coruscant, are visited more frequently than others, each film showcases new planets with unique ecosystems. When the biospheres of these worlds are examined in the context of the time they appear during the ongoing plot of the films, many instances of symbolic imagery and moments of foreshadowing are uncovered.

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