Why does the sun have dark spots on it (sunspots)?
The Sun contains a chaotic tangle of flux tubes. Sometimes a section of a large flux tube expands and rises through the sun's "surface." This creates two sun spots of opposite polarity. The spots move apart as the tube continues to rise and expand, moving toward the poles to which they are attracted. Eventually the flux tube will arrive at said poles, weakening the magnetic field. After 11 years the field is weakened enough that it reverses.Why does the sun have dark spots on it (sunspots)?