Gr 9 NATURAL SCIENCES: Ch 4.5 The birth of a star
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Questions and Answers

What is the temperature required for nuclear fusion reactions to begin in a star?

  • 5 million degrees Celsius
  • 50 million degrees Celsius
  • 10 million degrees Celsius (correct)
  • 1 million degrees Celsius

    • What process prevents further contraction of a star?

  • Gravitational Force
  • Galactic Rotation
  • Nuclear Fusion (correct)
  • Stellar Wind

    • What is emitted by a young star that gradually blows away the surrounding gas and dust?

  • Galactic Wave
  • Stellar Wind (correct)
  • Solar Flare
  • Cosmic Ray

    • What is the term for the birthplaces of stars?

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

    What is the early stage of a star's formation called?

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

    What is the process that powers stars?

    <p>Nuclear Fusion</p> Signup and view all the answers

    What is the outflow of charged particles from a star called?

    <p>Stellar Wind</p> Signup and view all the answers

    What can be formed in the surrounding gas and dust of a young star?

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

    What is the term for a large cloud of gas and dust in space where stars are born?

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

    What is the process by which nuclei of light elements combine to form heavier elements, releasing energy?

    <p>Nuclear Fusion</p> Signup and view all the answers

    What is the stage of a star's life where it is not yet hot enough for nuclear fusion?

    <p>Protostar Stage</p> Signup and view all the answers

    What is the term for a group of stars forming a recognizable pattern?

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

    What is the initial stage of star formation?

    <p>Initial Collapse</p> Signup and view all the answers

    What is the term for streams of charged particles emitted from a star?

    <p>Stellar Wind</p> Signup and view all the answers

    What is the result of the fragmentation of a collapsing cloud?

    <p>Formation of multiple stars</p> Signup and view all the answers

    What is the main trigger for the collapse of a nebula?

    <p>A passing through a spiral arm of a galaxy</p> Signup and view all the answers

    What is the typical mass range of nebulae?

    <p>100,000 to 2 million times that of the Sun</p> Signup and view all the answers

    What happens to the clumps as they contract during the formation of stars?

    <p>They heat up and flatten into disk shapes</p> Signup and view all the answers

    What is the duration of the protostar stage?

    <p>50 million years</p> Signup and view all the answers

    What is the result of the increasing mass of a protostar?

    <p>An increase in temperature at its core</p> Signup and view all the answers

    What is visible to the naked eye under dark skies in the constellation of Orion?

    <p>The Orion Nebula</p> Signup and view all the answers

    What is the term for the process of gradual change or development of stars?

    <p>Stellar Evolution</p> Signup and view all the answers

    What is the result of nuclear fusion reactions in a star?

    <p>The release of vast amounts of energy in the form of heat and light</p> Signup and view all the answers

    What is the primary function of stellar winds in a young star?

    <p>To gradually blow away the surrounding gas and dust</p> Signup and view all the answers

    What is the composition of a nebula?

    <p>Gas and dust</p> Signup and view all the answers

    What is the term for the stage of a star's formation before nuclear fusion begins?

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

    What is the energy source that powers a star?

    <p>Nuclear fusion</p> Signup and view all the answers

    What is the effect of nuclear fusion on a star's contraction?

    <p>It prevents further contraction</p> Signup and view all the answers

    What is the term for the outflow of charged particles from a star?

    <p>Stellar wind</p> Signup and view all the answers

    What is the location where stars are born?

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

    What is the primary mechanism by which a protostar becomes a main-sequence star?

    <p>Nuclear fusion ignition</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a nebula?

    <p>Is a stable, long-lived structure</p> Signup and view all the answers

    What is the effect of stellar winds on the surrounding interstellar medium?

    <p>It disperses the surrounding gas and dust</p> Signup and view all the answers

    What is the ultimate energy source that powers a star?

    <p>Thermal energy released from nuclear fusion</p> Signup and view all the answers

    What is the term for the process by which a protostar contracts and heats up?

    <p>Kelvin-Helmholtz contraction</p> Signup and view all the answers

    What is the most likely outcome of a nebula's collapse?

    <p>Formation of a star or multiple stars</p> Signup and view all the answers

    What is the primary function of nuclear fusion in a star?

    <p>To release energy and maintain the star's temperature</p> Signup and view all the answers

    What is the expected outcome of a star's contraction during its protostar stage?

    <p>The star's core will heat up</p> Signup and view all the answers

    What is the primary reason for the formation of a protostar at the center of a collapsing clump?

    <p>Due to the increased density at the center of the clump</p> Signup and view all the answers

    What is the typical shape of a collapsing clump as it contracts during the formation of stars?

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

    What is the primary trigger for the collapse of a nebula?

    <p>Passing through a spiral arm of a galaxy</p> Signup and view all the answers

    What is the primary effect of the increasing mass of a protostar?

    <p>An increase in temperature at its core</p> Signup and view all the answers

    What is the primary characteristic of a stellar nursery?

    <p>A region with a high density of gas and dust</p> Signup and view all the answers

    What is the primary reason for the formation of multiple stars from a single collapsing cloud?

    <p>Due to the fragmentation of the collapsing cloud</p> Signup and view all the answers

    What is the primary effect of the fragmentation of a collapsing cloud?

    <p>The formation of multiple stars</p> Signup and view all the answers

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