photons
  • The source of energy that keeps the Sun shining today is _________.
  • Rank the layers of the Sun based on their density, from highest to lowest.
  • In which of the following layer(s) of the Sun does nuclear fusion occur?
  • Solar energy leaves the core of the Sun in the form of
observation: The photosphere is made mostly of hydrogen and helium,The photosphere emits mostly visible light,The corona is hotter than the photosphere, The Sun emits neurtrinos and inferences: The Sun generates energy by fusing hydrogen into helium,The core temperature is 10 million k, The convection zone is cooler than the radiation zone,The composition of the photosphere is the same as that the gas cloud that have birth to our solar system.
  • A solar model is used to calculate the expected temperature and density at all depths within the Sun. These results are then used to calculate the expected fusion rate within the Sun. We have confidence that the model is correct because it agrees with the observed characteristics of the Sun. Which of the following observations can be used to check that we really do know the Sun's internal fusion rate?
  • To understand the interplay of observations and models you must first be able to distinguish between things that we observe and things that we infer from models. Consider the following statements about the Sun. Classify each statement as an observation or as an inference based on the current, accepted model for the Sun.
  • One statement about the Sun from Part A is "The corona is hotter than the photosphere." Which of the following statements provides observational evidence for this claim?
  • If fusion reactions were to suddenly shut off in the Sun, how would we be able to tell?
If the fusion rate initially increases, then the core expands.If the fusion rate initially decreases, then the core contracts.
  • What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
  • Which of the following layers of the Sun can be seen with some type of telescope? Consider all forms of light, but do not consider neutrinos or other particles
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • Which of the following changes would cause the fusion rate in the Sun's core to increase?
The Sun would begin to cool and get smaller and smaller as it morphs into a brown dwarf. The Earth would likewise slowly cool. It might be livable for a few more years besides for poor crop yields, famine, and expanding ice sheets. Given enough supplies, equipment, and fuel to heat themselves a small group of people might be able to survive on Earth for quite along time. The Earth's core would still be warm so I doubt Earth's atmosphere would freeze too quickly.The sun would begin to collapse,the collapse would maintain it's temperature and brightness at first.It would visibly shrink and slowly darken and very soon disappear from the naked eye
  • If fusion reactions were to suddenly shut off in the Sun, how would we be able to tell?
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • Which of the following changes would cause the fusion rate in the Sun's core to increase?
  • What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
The corona primarily emits X rays while the photosphere primarily emits visible light.
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • Which of the following layers of the Sun can be seen with some type of telescope? Consider all forms of light, but do not consider neutrinos or other particles
  • What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
  • One statement about the Sun from Part A is "The corona is hotter than the photosphere." Which of the following statements provides observational evidence for this claim?
Greatest distance corona, chromosphere, photosphere, convection zone, radiation zone, core. least distance.
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
  • Rank the following layers of the Sun based on the pressure within them, from highest to lowest.
  • Listed following are the different layers of the Sun. Rank these layers based on their distance from the Sun's center, from greatest to least.
core, radiation zone, convection zone,photosphere, chromosphere, corona.
  • Rank the layers of the Sun based on their density, from highest to lowest.
  • Which of the following changes would cause the fusion rate in the Sun's core to increase?
  • Rank the following layers of the Sun based on their temperature, from highest to lowest.
  • What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
nuclear fusion
  • Rank the layers of the Sun based on their density, from highest to lowest.
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • The source of energy that keeps the Sun shining today is _________.
  • In which of the following layer(s) of the Sun does nuclear fusion occur?
core, chromosphere, and photosphere.
  • What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
  • Which of the following must occur for a star's core to reach equilibrium after an initial change in fusion rate?
  • Which of the following layers of the Sun can be seen with some type of telescope? Consider all forms of light, but do not consider neutrinos or other particles
  • Which of the following changes would cause the fusion rate in the Sun's core to increase?
gravitational force and outward pressure
  • Which of the following layers of the Sun can be seen with some type of telescope? Consider all forms of light, but do not consider neutrinos or other particles
  • Rank the following layers of the Sun based on the pressure within them, from highest to lowest.
  • What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
  • What would happen if the fusion rate in the core of the Sun were increased but the core could not expand?
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