Podcast
Questions and Answers
Explain how the depletion of fuel in a star's core leads to a decrease in its temperature.
Explain how the depletion of fuel in a star's core leads to a decrease in its temperature.
When the fuel in the center finishes, the energy generation stops. As a result, the temperature of the star starts decreasing.
Describe how the balance between gas pressure and gravitational force changes as a star's temperature decreases.
Describe how the balance between gas pressure and gravitational force changes as a star's temperature decreases.
Due to the decrease in temperature, the gas pressure decreases and the balance between gas pressure and gravitational force cannot be maintained.
How does the shift in balance between gravitational force and pressure contribute to the star's contraction?
How does the shift in balance between gravitational force and pressure contribute to the star's contraction?
As the gravitational force is now higher than the gas pressure, the star starts contracting.
What fusion process might occur after hydrogen is exhausted in the core of a star, and what element is typically involved?
What fusion process might occur after hydrogen is exhausted in the core of a star, and what element is typically involved?
Name the three end stages of stars?
Name the three end stages of stars?
Describe the relationship between a white dwarf's density and its size compared to Earth.
Describe the relationship between a white dwarf's density and its size compared to Earth.
Explain how energy generation inside a star stops.
Explain how energy generation inside a star stops.
Explain the reason for the evolution of stars?
Explain the reason for the evolution of stars?
What happens to the temperature of a star as a result of decreasing energy generation?
What happens to the temperature of a star as a result of decreasing energy generation?
What happens to the gravitational force as pressure decreases in stars?
What happens to the gravitational force as pressure decreases in stars?
Flashcards
How do stars evolve?
How do stars evolve?
Stars evolve as the burning of fuel decreases in the core.
Why do stars contract?
Why do stars contract?
Stars contract as gravitational force exceeds gas pressure when hydrogen is exhausted.
End stages of stars
End stages of stars
White dwarfs, neutron stars, and black holes
White dwarf density
White dwarf density
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Study Notes
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How do stars evolve?
- The reason for evolution of stars is the burning of fuel and therefore, the decrease in the amount of fuel in the center.
- When the fuel in the center finishes, the energy generation stops.
- As a result, the temperature of the star starts decreasing.
- Due to the decrease in temperature, the gas pressure decreases and the balance between gas pressure and gravitational force cannot be maintained.
- As the gravitational force is now higher than the pressure, the star starts contracting.
- This causes another fuel to start burning e.g. when hydrogen at the center is finished, helium starts undergoing fusion and energy generation starts again.
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What are the three end stages of stars?
- The three end stages of stars include:
- White Dwarf:
- Mstar << Msun <8<Msun
- Density of a star becomes high compared to Earth
- Small size and very stable
- White Dwarf:
- The three end stages of stars include:
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