Besides their color, what common characteristic do red dwarfs possess that poses a threat to potential habitability on orbiting planets?

Answer

They emit intense and devastating flares

Despite their slow fuel consumption, many red dwarfs exhibit intense magnetic activity leading to devastating flares that can strip away planetary atmospheres or sterilize surfaces.

Besides their color, what common characteristic do red dwarfs possess that poses a threat to potential habitability on orbiting planets?
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