The Sun is a yellow dwarf with a surface temperature of about 5800 Kelvin. It has an 11-year activity cycle where the number of sunspots and flares varies. These cycles are believed to be associated with changes in the Sun’s magnetic field.
Astronomers have long believed that red dwarfs should be calmer and more stable than the Sun. However, observations of these stars have shown the opposite: they often experience bright and powerful explosions. Such flares could pose a serious threat to life on planets around red dwarfs.
Source: Ferra
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