The luminous life of plants

International Year of Light Blog

“There are lots of dimensions of light that we cannot see with our eyes,” NASA Earth scientist Joshua Fisher explained, gesturing towards a couple of olive trees, “That’s the interesting science NASA does.” It was the third day of spring and we were sitting at a picnic table in the shade at NASA’s Jet Propulsion Laboratory in Pasadena, California, yakking away about fluorescent light, which plants emit during photosynthesis.

Light travels in waves. The human eye is adapted to see a small range of those waves in the visible part of the electromagnetic spectrum. A few NASA instruments, such as MODIS on the Aqua and Terra satellites, the Landsat suite of satellites, the Mars Reconnaissance Orbiter and Cassini, just to name a few, make observations in the visible part of the spectrum. But NASA has also created sensors specifically designed to pick up light waves outside of the visible spectrum…

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