Here are graphs of changes in the apparent magnitude and temperature of the star 5 Cephei during one period of variability.

Here are graphs of changes in the apparent magnitude and temperature of the star 5 Cephei during one period of variability. Compare the sizes of a star at maximum and minimum brightness: which one is larger and how many times?

At minimum, the radius is 5% larger.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.