Lines in the spectra of distant galaxies are shifted towards longer waves. This phenomenon is called the metagalactic redshift. It is interpreted, according to the Doppler principle, as an increase in the average distance between galaxies. The reason for this is, according to modern views, a huge explosion that occurred 10 – 20 billion years ago and led to the scattering of galaxies. According to new data, the explosion could have occurred at a time closer to us.
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.