NASA's Landsat 8 satellite snapped a stunning top-down view of an "unusually spectacular" Mount Etna eruption. Infrared data makes the volcano's lava river really pop.
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A red-hot lava flow two miles long has been attracting crowds to the slopes of Mount Etna on the island of Sicily, Italy.
Firefall' happens in the winter, when Horsetail Fall is flowing and the sunsent hits the waterfall just right. The phenomenon doesn't last long each year. Just for a few weeks, typically in February.