A specific form of this process that occurs for about a day maintains a state of quasi-equilibrium but not true statistical equilibrium. This process defines a stellar timescale whose numerator has a 0.007 (10[1])coefficient, and is around 10-to-the-4th that of the Kelvin–Helmholtz timescale. Different mechanisms for this physical process have temperature dependencies (10[1])of T-to-the-17 and (10[1])T-to-the-41. (10[2])In the Gamow window, this process is enhanced by (10[1])quantum tunneling (10[1]-5[1])through (-5[1])the (10[1])Coulomb (10[2]-5[1])barrier. (10[10]-5[2])This process (10[1])progressively begins (10[1])in increasingly outward shells, (10[1])forming (10[1])an onion-like (10[1])structure, (10[1])during (10[1])evolution (10[2])of massive stars. (-5[2])This process occurs to hydrogen (10[1])through the CNO (10[1])cycle (10[5]-5[1])and the (10[2])proton–proton (10[7])chain. (10[8])For 10 (10[1])points, (10[2])name this (10[1])process that powers stars, (10[2])in (10[1])which two nuclei (10[2])combine (10[1])to form (10[1])a larger (10[2])nucleus. (10[1]) (10[5])■END■