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Earth’s mysterious red glow, explained 

Explore the phenomenon and uses of chlorophyll fluorescence, a small amount of light emitted by plants during photosynthesis.

In 2009, a satellite circled Earth, scanning and sorting the wavelengths reflecting off the planet’s surface. Researchers noticed something baffling: an unexpected wavelength of unknown origin. They tried looking at Earth with only this wavelength, and saw the planet covered in a red hue of varying intensity. So, what was going on? Zoe Pierrat explores the science of chlorophyll fluorescence.

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1.3k shares, 287 points

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