According to calculations, supernovae should erupt in the Galaxy every 30 years. However, they are recorded much less frequently due to the absorption of light in the interstellar medium. Scientists have registered only 3 supernova explosions, except for the explosion in February 1987: June 4, 1054, November 5, 1572 and October 9, 1604.
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.