Red dwarfs

Red dwarfs are tiny, cool stars making up over 70% of our galaxy. If the Sun were a bright high-beam headlight, a red dwarf would be like a dim candle with a temperature around 3,000 K. They have only 8–50% of the Sun's mass, but through full convection, they mix fuel like a giant cauldron and burn hydrogen extremely slowly.

While the Sun will die in billions of years, these "space marathoners" can shine for trillions of years. They are often orbited by planets, but due to low luminosity, these worlds must be much closer than Earth is to the Sun to stay warm, exposing them to intense flares.