New stars are not newly appeared stars, but pre-existing ones, whose brightness has sharply increased due to the fact that hydrogen flows from one star from one star to another from the stars located next to each other.Hydrogen accumulates on the surface of a neighboring star and exceeding the critical mass, hydrogen explodes, because of this, the brightness of the star increases, which then returns to its previous level. With the outbursts of new stars, the brightness increases thousands and millions of times over a period from several days to several months. Stars are known to have flashed like novae several times.
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.