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This is likely the result of Alpha Centauri A's UV rays that it sends to Pandora. Blues and purples absorb a certain frequency of light, which may be the most common on Pandora. It helps with the process of photosynthesis, which the plants use in order to receive their energy.

It's also possible because blues greens and purples are considered cool and calming colors, while reds yellows and oranges are hot, warm or feirce.

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