Insane Northern Lights over Stonehenge last night. What looks like pure magic is actually physics stacked across the sky. Green auroras glow lowest, around 90–150 km above Earth, created when oxygen atoms are energized. Red auroras appear much higher, roughly 200–400 km up, where thinner air lets oxygen glow longer and deeper. Purple and violet tones form lower than green, about 80–100 km, caused by excited nitrogen. Blue hues emerge at the very lowest visible altitudes, near 80 km, also from ni
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Seeing purple? Or how about pink?What you are seeing are LED lights emitting light in red and blue wavelengths in order to provide supplemental sunlight during the winter months. One of our greenhouses is used to grow plants for the Smithsonian National Museum of Natural History exhibit “Butterflies Plants: Partners in Evolution.” The LED lights help keep 200 plants growing and flowering year-round, particularly during the winter when there are naturally lower light levels. The tropical, long bl
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2.4K views · 77 reactions | Seeing purple? Or how about pink? What...
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2.4K views · 77 reactions | Seeing purple? Or how about pink? What...
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