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CREDIT: ESO/L. Calçada

Luke Skywalker's home planet of Tatooine is a vivid desert world under two suns, but it may be missing one key detail: black trees.

According to a new study, Earth-like alien planets with multiple suns may host trees and shrubs that are black or gray instead of the more familiar green.

It all depends on the particulars of the light available for photosynthesis, the process by which plants convert sunlight into energy. Photosynthesis produces oxygen and ultimately provides the basis for most life on Earth.

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