For half a century, satellites have chased the same prize: ever sharper pictures of Earth. Each advance brought more pixels and greater clarity, but only in terms of how things looked. Now, a different kind of technology is emerging, one that reveals the biochemical composition of man-made and natural objects: hyperspectral imaging. By capturing hundreds of spectral bands tied to chemical and biological signals, it can detect crop stress before the eye can see it, trace pollutants as they spread or expose a camouflaged vessel by its unique spectral fingerprint.
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