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

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

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

What is the process that powers stars?

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

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

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

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

<p>Planets (B)</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 (A)</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 (B)</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 (A)</p> Signup and view all the answers

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

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

What is the initial stage of star formation?

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

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

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

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

<p>Formation of multiple stars (D)</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 (B)</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 (A)</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 (D)</p> Signup and view all the answers

What is the duration of the protostar stage?

<p>50 million years (C)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>Stellar Evolution (D)</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 (B)</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 (A)</p> Signup and view all the answers

What is the composition of a nebula?

<p>Gas and dust (A)</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 (D)</p> Signup and view all the answers

What is the energy source that powers a star?

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

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

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

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

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

What is the location where stars are born?

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

What is the ultimate energy source that powers a star?

<p>Thermal energy released from nuclear fusion (D)</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 (B)</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 (B)</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 (B)</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 (D)</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 (B)</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 (D)</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 (A)</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 (B)</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 (B)</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 (B)</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 (B)</p> Signup and view all the answers

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