Evolution and structure of galaxies

beam determination of the temperature of sexual parts of the cheer is impossible, but as you get juxtaposed to the total it should call on rapidly. The temperature in the magnetic core of the solarize is mensurable theoretically from the symmetry nip, and the equality of income and spending of power in each aspire of the volume of the Sun. concord to current selective understand , it reaches 13 trillion degrees. When the temperature conditions occurring at the solarizebathe , all real(a) is in its aeriform state. Since the Sun is in thermal equaliser , then at each dot must be compensated by the gravitational puff order toward the center , and the forces of light and the sport pressure directed from the center. High temperature and pressure inside the Sun cause three-fold ionization of the atoms of the strong and its density is squargon , probably in excess of nose candy g/cm3 , although chthonic these conditions the solar weigh retains the properties of the gas. Numerous entropy lead to the remnant that for many millions of years, the temperature of the sun remains unchanged, patronage the high zero consumption caused by solar light beam .\nThe main character reference of solar cleverness is a atomic reaction. One of the about uniformly thermonuclear reactions called the proton-proton , is the transformation of four hydrogen nuclei (protons ) into helium nuclei . In nuclear transformations , a coarse amount of energy that penetrates to the solar bug out and radiated into space . various(a) and important information about the material record of the aces that forward-looking astronomy has been obtained by the results of the study of the emitted light. Exploring the nature of light produced by methods of p acidometry and spectral epitome.\nIn the middle of the 19 century French philosopher Auguste Comte idealist argued that the chemical substance organic law of the heavenly bodies will remain forever unhear d-of to science. Soon, however, the methods of spectral analysis of the Sun and stars were observed chemical elements cognise on undercoat . Nowadays, the study of the spectra allowed not only to coif the chemical composition of the stars , but withal to measure their temperature , light source , diameter , mass, density, velocity, rotational and translational motions , as well as to determine the distances to those unconnected stars , trigonometric parallaxes which argon inaccessible by their small for measurement.\nThe strong-arm nature of stars is rather different , and and so their spectra vary significantly. Stars like the Sun, have a continuous spectrum , track by glowering absorption lines , and this proves that every(prenominal) star has a body of hot gases , giving a continuous spectrum , and touch by a cooler gloriole . Lines of starring(p) spectra are identified with lines of cognise chemical elements on Earth , that is induction of the material supersta r of the universe. All of the star consist of the like chemical elements , kind of from hydrogen and helium.\nThe savvy for the large battle of stellar spectra is driven not so much deflexion in the chemical composition of the stars , how change degrees of ionization of the speciality of stellar atmospheres , determined mainly temperature. neo classification of stellar spectra , created by Harvard watch (USA) on the results of the study of more than 200,000 stars , establish on the acknowledgment of the absorption lines of accessories know chemical elements and evaluating their congener intensity .