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Kind of makes you wonder whether we’d recognise aliens even if they were visiting us. “Bacteria Living in ‘Cloud Cities May Control Rain and Snow Patterns“:

Some bacteria can influence the weather. Up high in the sky where clouds form, water droplets condense and ice crystal grow around tiny particles. Typically these particles are dust, pollen, or even soot from a wildfire.

But recently scientists have begun to realize that some of these little particles are alive — they are bacteria evolved to create ice or water droplets around themselves. Some of them live in clouds (so you can think of them like tiny little Lando Calrissians, pictured below), and here and there they may be numerous enough to change rain and snowfall patterns.

Could this sort of ‘unknown’ be found in future to be a cause of, or at least contributor to, climate change?