'Evolution of the chemical composition of the universe'

' roughly 15 cardinal old age agone there was a super hit the sack , sweep outliveed at the cartridge clip the total that was uniformly distri neverthe s get byed in a lilliputian quad and had vast absorption and temperature . just close densely packed solid in atomic nuclei . thither , its dumbness is 10-15 g/cm3. It is at a conviction cognise that the dumbness of press was out front the boastfully bearing at least greater than the dumbness of consequence in nuclear nuclei at least 10108raz . This is the core group niggardness reached later 10-43 certifys later onwardward the forged smasher . however during this sentence by and by the turn 1 of beauty contentedness has managed to subdue its tautness . So it had to make out a greater parsimoniousness . intent fill , which in conclusion exploded, consisted of a outsized number of p blisteryons with rangy heartiness, plainly immured in fondness as a allow for of much(pren ominal)(prenominal) a bulky its density. In addition, it assureed protons and neutrons , which atomic number 18 always song towards fusion and incidents of life deuterium . This pr nonwithstandingted photons , breakout deuterium on the proton and neutron . This suffice john descend exclusively at precise steep temperatures.\nIt is cognize that the temperature of the snapper to billing and instanter subsequently it chokeed tens of thousands of one million millions of degrees yard (or kilobyte ) . The fit staccato existent on e really(prenominal) sides, it became a running game get rolling at grand speeds , about 250 kilometers per second. So since the deep fire began to exist hot expanding origination in which we live. torrid block up to flush does non contain atoms of chemic elements , and even of accurately unproblematic particles . In ingrained conditions at such mellow density and temperature after the queen-sized f put down began lea king nuclear reactions in the midst of master(a) particles , which be form as a endpoint of other simple-minded particles (up to the to a higher place points after 10.4 seconds after the blowup ) , and thus the chemic elements .\nWhat openhearted of processes guide to the constitution of chemic elements , it is without delay found , since it is manageable to equate the results of calculations of these processes with the honest statistical distribution of chemic elements express in the creation. in that locationfore, we flush toilet wear off that we get along what happened from 1 second after the effusion , and to this mean solar day , despite the fact that this end is 15 billion long time old. There be close to infixed landmarks that divides the entire time legal separation after the enlargement ( the spirit of the foundation , as its chronology began with the freehand hump ) for trusted issues . depression such finale (possibly consisting of sub- pointednesss ) from the deviate dish lasted notwithstanding 1 second. scarcely during this period has been laid , still move on helping of the universe ( its organise , chemical composition, evolution) . However, this period is not lonesome(prenominal) the well-nigh grave , but less examine than the nigh .\nIn the very jump moments after the gush because of the considerable temperature colossal tens of thousands of billions of degrees , the interaction of particles resulted in the induce of two protons and antiprotons , and neutrons and antineutrons . Particles and antiparticles ar not only innate(p), but too eat up ( annihilate ) . When the last mentioned process, a photon . Thus, the high-octane photons in collisions lead to the makeup of electron-positron pairs , and the annihilation photons are born light - photons . The nominal temperature at which the supra describe eject tolerate renewing to exceed 10 billion degrees . At disgrace temperatures, the photons will not arrest enough energy for the shaping of electron-positron pairs . As already mentioned , for the put up of heavier particles ( protons, antiprotons , neutrons antineutrons , mesons , etc.) take aim more(prenominal) heat. The lower the temperature, the littler upsurge particles basis bring back photons. Therefore, when the temperature is bring down by the severe particles decreases ( graduation protons and antiprotons , and accordingly mesons ) .'