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Gr 9 NATURAL SCIENCES: Ch 4.5 Death of a star
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Gr 9 NATURAL SCIENCES: Ch 4.5 Death of a star

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Questions and Answers

What is the term for the glowing shell of gas that surrounds a dying star?

  • White dwarf
  • Black hole
  • Neutron star
  • Planetary nebula (correct)

    • What is the result of a star's core collapsing under gravity?

  • A white dwarf forms
  • A planetary nebula is formed
  • A supernova explosion occurs (correct)
  • A black hole is created

    • What is the term for a star that has cooled and no longer emits light?

  • Black dwarf (correct)
  • Neutron star
  • White dwarf
  • Red supergiant

    • What is the stage of a star's life cycle when it fuses heavier elements in its core?

    <p>Red supergiant</p> Signup and view all the answers

    What is the remnant of a star that has undergone a supernova explosion?

    <p>Neutron star</p> Signup and view all the answers

    What is the stage of a star's life cycle when it expands and contracts repeatedly?

    <p>Red giant</p> Signup and view all the answers

    What is the term for a star that is about the size of Earth but contains the mass of the original star's core?

    <p>White dwarf</p> Signup and view all the answers

    What is the consequence of a star's core filling with iron?

    <p>The star undergoes a supernova explosion</p> Signup and view all the answers

    What is the minimum mass of a star that will become a red supergiant?

    <p>Eight times the mass of the Sun</p> Signup and view all the answers

    What is the stage of a star's life cycle when it is fusing hydrogen in its core?

    <p>Main sequence</p> Signup and view all the answers

    What is the primary reason for a star to become unstable and expel its outer layers?

    <p>The star's hydrogen fuel is depleted.</p> Signup and view all the answers

    What is the difference between a white dwarf and a black dwarf?

    <p>Their temperature, with black dwarfs being cooler.</p> Signup and view all the answers

    Which of the following is a characteristic of a red supergiant?

    <p>It is a large, cool star.</p> Signup and view all the answers

    What is the result of a star's outer layers being expelled into space?

    <p>The formation of a planetary nebula.</p> Signup and view all the answers

    Why do stars more than eight times the mass of the Sun become red supergiants?

    <p>Because they have depleted their hydrogen fuel.</p> Signup and view all the answers

    What is the fate of a star that undergoes a supernova explosion?

    <p>It is destroyed, leaving behind a neutron star or black hole.</p> Signup and view all the answers

    What is the main difference between a low-mass star and a high-mass star?

    <p>Their fate, with low-mass stars becoming white dwarfs and high-mass stars undergoing a supernova.</p> Signup and view all the answers

    What is the current state of black dwarfs in the universe?

    <p>No black dwarfs exist in the universe yet.</p> Signup and view all the answers

    What is the role of gravity in the death of a massive star?

    <p>Gravity causes the star's core to collapse, leading to a supernova.</p> Signup and view all the answers

    What is the composition of a neutron star?

    <p>Mainly composed of neutrons.</p> Signup and view all the answers

    What is the primary mechanism by which a star's core collapses under gravity?

    <p>Iron core accumulation</p> Signup and view all the answers

    What is the relationship between a star's mass and its likelihood of becoming a red supergiant?

    <p>Only stars with more than 8 times the mass of the Sun become red supergiants</p> Signup and view all the answers

    What is the consequence of a star's outer layers being expelled into space?

    <p>The creation of a planetary nebula</p> Signup and view all the answers

    What is the difference between a white dwarf and a neutron star?

    <p>Their composition</p> Signup and view all the answers

    What is the fate of a star that undergoes a supernova explosion?

    <p>It is completely destroyed, leaving behind a neutron star</p> Signup and view all the answers

    What is the role of nuclear fusion in the death of a low-mass star?

    <p>It stops, allowing the star to cool and become a white dwarf</p> Signup and view all the answers

    What is the characteristic of a star that is about the size of Earth but contains the mass of the original star's core?

    <p>It is a white dwarf</p> Signup and view all the answers

    What is the relationship between a star's life cycle and its mass?

    <p>Low-mass stars live longer than high-mass stars</p> Signup and view all the answers

    What is the current state of black dwarfs in the universe?

    <p>They are expected to exist but have not yet formed</p> Signup and view all the answers

    What is the primary difference between the death of a low-mass star and a high-mass star?

    <p>The type of remnant left behind</p> Signup and view all the answers

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