The Evolution of the star of the mass similar to that of the mass of the Sun wil

Question

The Evolution of the star of the mass similar to that of the mass of the Sun will most likely take following steps: 1)__________the stage before the ignition of the nuclear reactions converting 2)__________ into 3)__________ 4)_________Star -- star is in equilbrium during this stage: the force of 5)________ is equal to the force of 6 )________ pressure stabilizing the star's radius. The conversion of the 7)________ into 8_______via nuclear 9)_______ is providing the radiation in the stellar 10)__________ This stage typically last up to 11)________ billion years. 12) _________ -- as result of depletion of the 13)_________ in the stellar 14)_______, and increased density of 15)________ the star can now convert 16)_______ into the 17)_______. This set of reactions provide the net energy that is much 18)________ than the one fuelling the previous stage. As result the force of 19) ________ is higher than the force of 20)________acting on he star which leads to the 21)_________ of star's radius. The star of Sun's mass will last in this stage for up to 10 22)________ years. 23 )__________ 24 )_________ 25 )__________

Explanation / Answer

Look at the diagram on the right. There are essentially two sections of a star: the core (where fusion occurs), and an outer gaseous shell. The core serves as the gravitational “center” of the star. It is very hot and very dense. The outer shell is made of hydrogen and helium gas. This shell helps move heat from the core of the star to the surface of the star where energy in the form of light and heat is released into space. The star’s main goal in life is to achieve stability, or equilibrium. The term equilibrium does not mean that there isn’t any change in the star. It just means that there is not a net overall change in the star. In a stable star, the gas pressure pushing out from the center is equal with the gravity pulling atoms inward to the center – when these forces are equal, the star is at equilibrium. Once a star reaches equilibrium for the first time, it will start burning (fusing) hydrogen into helium. This 5-step process works like this: 1)Nuclear fusion. Gravity = gas pressure (equilibrium) 2)Out of fuel. 3)Fusion stops, temperature drops. 4)Core contracts (gravity pulling atoms in). 5)Increased temperature (more atoms, more collisions) and density in the core reinitiates nuclear fusion, equilibrium is achieved, and the cycle begins again at step

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