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 (C)</p> Signup and view all the answers

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

<p>Neutron star (C)</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 (A)</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 (B)</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 (D)</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 (D)</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 (D)</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. (A)</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. (D)</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. (A)</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. (A)</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. (B)</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. (C)</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. (C)</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. (A)</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. (C)</p> Signup and view all the answers

What is the composition of a neutron star?

<p>Mainly composed of neutrons. (D)</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 (C)</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 (B)</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 (A)</p> Signup and view all the answers

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

<p>Their composition (B)</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 (D)</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 (D)</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 (B)</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 (D)</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 (C)</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 (C)</p> Signup and view all the answers

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