Formation of a Star: Protostar to Nuclear Fusion
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Questions and Answers

What is a protostar?

  • A middle-aged star that is gathering mass from its parent stellar nebula.
  • A fully formed star that has stopped accumulating mass.
  • A star that is about to explode in a supernova.
  • A very young star that is still gathering mass from its parent stellar nebula. (correct)

    • What initiates nuclear fusion in a star?

  • Decrease in core temperature.
  • Core becoming denser and hotter. (correct)
  • Loss of mass from the star.
  • Radiation from neighboring stars.

    • What differentiates massive stars from average stars?

  • Average stars have shorter lifespans.
  • Average stars are larger in size than massive stars.
  • Massive stars have longer lifespans.
  • Massive stars burn through their nuclear fuel more quickly. (correct)

    • What is the defining characteristic of a red giant?

    <p>It is a stage in the life cycle of a star with mass similar to the Sun.</p> Signup and view all the answers

    What powers a star to maintain a stable size and temperature?

    <p>Constant energy output from nuclear fusion.</p> Signup and view all the answers

    When does nuclear fusion ignite in a star?

    <p>Once the core temperature reaches millions of degrees.</p> Signup and view all the answers

    What is the final evolutionary phase of a star that has exhausted its nuclear fuel and has become a white dwarf?

    <p>Black Dwarf</p> Signup and view all the answers

    Which type of neutron stars emit beams of electromagnetic radiation and are known as pulsars?

    <p>Magnetar</p> Signup and view all the answers

    What marks the conclusion of the luminous energy-producing aspect of a star's existence?

    <p>Black Dwarf</p> Signup and view all the answers

    During a supernova, what process leads to the formation of heavy elements like gold, silver, and uranium?

    <p>Explosive Rebound</p> Signup and view all the answers

    Which type of star experiences gravitational collapse, leading to an explosive rebound known as a supernova?

    <p>Black Hole</p> Signup and view all the answers

    What do red super giants have in common with red giants in terms of nuclear fusion?

    <p>They fuse helium into carbon and oxygen</p> Signup and view all the answers

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