Fill in the missing letters in the paragraph.
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Red dwarfs are the most common type of star in the Milky Way, yet they are often difficult to observe due to their low lumi_ _ _ _ _ _ . Compared _ _ larger stars, red dwarfs burn fuel far more slowly, allowing them to rem_ _ _ stable for trillions of years. This extraordinary longe_ _ _ _ has led astronomers to consider  the possibility that planets orbiting red dwarfs could sustain life. However, such stars are also known for frequent stellar flares, which may substantially affect the atmospheres of nearby planets and po_ _ challenges for long-term habitability.