ignited. Stellar nucleosynthesis takes place in succesive burning phases. When the fuel of a preceding burning phase has been consumed, the ash of this burning phase is the fuel for the next burning phase. In the outer layers the previous burning phases still continue. The different burning phases are hydrogen burning (pp–chain, CNO–cycle, Ne–Na cycle, Mg–Al cycle), helium, carbon, neon, oxygen and silicon burning. In hydrogen burning helium is produced, in helium burning carbon and oxygen are synthesized, in the remainig advanced burning phases elements up to elements in the region of iron are produced. In successive burning phases the temperature must get larger, because of the increasing Coulomb barriers of the fusing heavier nuclei (Table \[t1\]).

The stars in which hydrogen burning takes place are named main–sequence stars, whereasold­er — in my 30s.” But after meet­ing peo­ple her age and younger at the Sum­mit who are run­ning for office, she said she is now ​“think­ing more seri­ous­ly about run­ning for State House in the next two years.”

One such inspir­ing young can­di­date is Car­los Ramirez-Rosa, 26, a for­mer Illi­nois Coali­tion for Immi­grant and Refugee Rights orga­niz­er who, with the back­ing of Reclaim Chica­go as well as numer­ous oth­er unions and pro­gres­sive groups in the city, became Chicago’s youngest alder­man last year. Or Abel DeMar­cos, 18, who is run­ning for city coun­cil in Flint, Michi­gan. Or the count­less oth­ers who announced their can­di­da­cy in pop­corn style through­out the weekend.

And though the new­found enthu­si­asm for tak­ing over local, state and fed­er­al branch­es of gov­ern­ment has many elec­tri­fied, there was