Review Questions Of The Overall Nuclear Energy Reflection In The Sun

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2. What two forces are balanced in gravitational equilibrium? What does it mean for the Sun to be in energy balance? The two forces I gravitational equilibrium is Gravity and thermal pressure. The Sun is not expanding or contracting because the energy from gravity pulling inward is equal to the gas pressure pushing outward. The energy is in equilibrium. The gravitational equilibrium is the balance when the inward pull of gravity & the outward push of internal gas pressure occurs. the energy balance in the sun refers to the balance between the rate at which fusion releases energy in the suns core and the rate when the the suns surface discharges this energy into space. 7. What is the overall nuclear fusion reaction in the Sun?…show more content…
What is a molecular cloud? Briefly describe the process by which a protostar forms from gas in a molecular cloud? Molecular cloud is a cool, dense interstellar cloud in which the low temperature allow hydrogen to pass up into hydrogen molecules. A protostar forms When a huge molecular cloud starts to collapse, gravity then pulls the gas toward the cloud 's densest regions, which causes it to break into smaller pieces that each form one or more stars which is a protostar. 5. What is degeneracy pressure, and how does it differ from thermal pressure? Explain why degeneracy pressure can support a stellar core against gravity even when the core becomes cold. Degeneracy pressure stops contraction before hydrogen burning starts. Degeneracy depends on density, not temperature. It differs from thermal pressure because thermal pressure is ordinary gas pressure. degeneracy pressure can support a stellar core against gravity even when the core becomes cold, When the core becomes cold, the density would increase and push the molecules of the core closer together. Degeneracy pressure will not let this happen b/c no two electrons can occupy the same space which will create a pressure and support itself against

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