Birth of the Sun
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Questions and Answers

What is the approximate age of the sun as a star?

  • 100,000 years
  • 1 billion years
  • 4.6 million years
  • 4.6 billion years (correct)

    • How many stars are estimated to be in the sky, according to the text?

  • Over 100 billion stars (correct)
  • Around 10 billion stars
  • Over 50 billion stars
  • Over 200 billion stars

    • What is the sun's role in relation to life on Earth?

  • Source of heat
  • Source of water
  • Source of energy (correct)
  • Source of air

    • What did people in ancient times believe the sun was?

    <p>A burning ball of fire created by the gods</p> Signup and view all the answers

    How big is the sun in comparison to Earth?

    <p>Over one million Earths could fit inside the sun</p> Signup and view all the answers

    What caused the collapse of the nebula described in the text?

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

    How far away is the giant interstellar cloud of dust and gas mentioned in the text?

    <p>&gt; 100,000 light-years away</p> Signup and view all the answers

    What happens in the sun's core that enables it to become a star?

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

    During which stage of the sun's life is gravity pressure equal to the force of fusion energy in the core?

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

    What will happen to the Earth in a billion years due to the increase in the sun's energy?

    <p>Extreme greenhouse effect</p> Signup and view all the answers

    In 3.5 billion years, what dramatic effect will occur on Earth due to the sun's increased brightness?

    <p>Evaporation of oceans and glaciers</p> Signup and view all the answers

    What process will cause the sun to engulf the planets Mercury and Venus in about 6 billion years?

    <p>Expanding into a red giant</p> Signup and view all the answers

    What will the sun become near the end of its life after fusing all helium into carbon?

    <p>A white dwarf</p> Signup and view all the answers

    Which phase of the sun's life allows it to fuse heavier nuclei like helium into carbon?

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

    What happens to the outer regions of a white dwarf as it cools down?

    <p>'They get blasted off forming a planetary nebula'</p> Signup and view all the answers

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