![]() The light of a red dwarf is different from the light generated by Sol. It still blows flares, terrorizing its planets, but such events are far more rare. On the other hand, Barnard's Star is far more friendly, but not safe. This will be a nightmare for settlers trying to make a new Earth here. Solar spots can form anytime and decrease luminosity by a few times. Around a flare star like UV Ceti (see image to right), flares can reach huge dimensions, increasing stellar energy output by many times in only a few seconds. ![]() One good example of a flare star is UV Ceti, while one more friendly star is Barnard's Star. Red dwarfs can be divided into two main groups: flare stars and more stabile, "friendly" stars. A Habitable Zone exists around the vast majority of red dwarfs. An Earth-like planet would be in a torch orbit. These stars have very long lifetime because they burn their hydrogen slowly. Their luminosity is very dim and red in color. Their mass is below 40% of the mass of our sun, Sol. M-type stars are the most common stars in the universe, known as red dwarfs. For a classification of stars see The H-R Diagram.
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