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why does a star grow larger immediately after it exhausts its core hydrogen?

Why do we think this is the case?At the end of a high-mass star's life, it produces new elements through a series of helium capture reactions.Which element has the lowest mass per nuclear particle and therefore cannot release energy by either fusion or fission?Suppose that hydrogen, rather than iron, had the lowest mass per nuclear particle. What would it look like to the naked eye?Betelgeuse would remain a dot of light but would suddenly become so bright that, for a few weeks, we'd be able to see this dot in the daytime.Why is Supernova 1987A particularly important to astronomers?It is the nearest supernova to have occurred at a time when we were capable of studying it carefully with modern telescopes.It is produced during the supernova explosions of high-mass stars.Why do scientists think that our solar system must have formed sometime after nearby supernovae explosions?What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure?Which is more common: a star blows up as a supernova, or a star forms a planetary nebula/white dwarf system?A spinning neutron star has been observed at the center of aYou discover a binary star system in which one member is a 15MSun main-sequence star and the other star is a 10MSun giant. A) The outer layers of the star are no longer gravitationally attracted to the core. B) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.

How many helium nuclei fuse … Why does a star grow larger immediately after it exhausts its core hydrogen? Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.

What happens after a helium flash? Which of the following would be true?What types of stars end their lives with supernovae?stars that are at least several times the mass of the SunWhy is iron significant to understanding how a supernova occurs?Iron cannot release energy either by fission or fusion.the sudden collapse of an iron core into a compact ball of neutronsSuppose the star Betelgeuse (in Orion) were to become a supernova tomorrow (as seen here on Earth).
After the core of a massive star exhausts its hydrogen, fusion moves to the shell around the core. B) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.


What do astronomers mean when they say that we are all "star stuff"?that the carbon, oxygen, and all elements heavier than helium that are essential to life were created by nucleosynthesis in stellar coresIn the context of understanding stellar lives, "high-mass" stars have massesIn the context of understanding stellar lives, "low-mass" stars have massesWhich of the following is not involved in carrying energy outward from a main sequence star's coreLuminosity, temperature, and radius gradually increase.What happens when a star exhausts the hydrogen in its core?Its core contracts, but its outer layers expand and the star becomes bigger and brighter.What is happening inside a star while it expands into a subgiant?It is fusing hydrogen into helium in a shell outside the core.The main source of energy for a star as it grows in size to become a red giant ishydrogen fusion in a shell surrounding the central core.Why does a star grow larger after it exhausts its core hydrogen?Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.Compared to the star it evolved from, a red giant isWhy is a 1 solar mass red giant more luminous than a 1 solar mass main sequence star?Fusion reactions are producing energy at a greater rate in the red giant.Which of the following pairs of atomic nuclei would feel the strongest repulsive electromagnetic force if you tried to push them together?combines three helium nuclei fuse to form one carbon nucleus.At approximately what temperature can helium fusion occur?a red giant star whose atmosphere becomes carbon-rich through convection from the corethe expanding shell of gas that was ejected in the final stages of a low-mass star's life that is no longer gravitationally bound to the remnant.In the end, the remaining core of a 1 solar mass star will be left behind asRight after it forms, a white dwarf is (compared to the star it evolved from)What can we learn about a star from a life track on an H-R diagram?what surface temperature and luminosity it will have at each stage of its lifeWhich of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?How are low-mass red giant stars important to our existence?These stars manufactured most of the carbon and oxygen atoms in the universe.a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalystsIn order to predict whether a star will eventually fuse carbon, what do you need to know about the star?High mass stars evolve more rapidly than low mass ones because the high mass starsCarbon fusion occur in high-mass stars but not in low-mass stars becausethe cores of low-mass stars never get hot enough for carbon fusion.Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, etc.)

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