The lifetime of a star

The life of a star is a magnificent epic of the universe. During the period of main sequence stars, hydrogen fusion provides energy. As hydrogen fuel decreases, star evolution varies. Small mass stars expand into red giants, and outer matter diffuses into planetary nebulae; Massive stars may explode into supernovae, collapse into neutron stars or black holes. The lifetime of a star creates the heavy elements in the universe, laying the material foundation for the birth of life. Stars are important witnesses to the evolution of the universe.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

Hertzsprung Russell diagram, abbreviated as H-R diagram, HR diagram or HRD, is a scatter plot of a star's absolute magnitude or luminosity relative to its spectral type or effective temperature. Simply put, it plots each star on a chart that measures its temperature (color) and luminosity, regardless of the position of each star. The evolution of stars can be divided into four stages: the first stage is the birth of stars (juvenile period); The second stage is the main sequence week (prime period), during which most stars in the universe are in this stage; When a star becomes a red giant, it enters the third stage; Finally, the star enters the explosive stage, slowly collapsing and disappearing, and the final product is a black hole/white dwarf/neutron star. The initial mass is the most important factor affecting a star, and the influence of the stellar environment can also lead to completely different stars.