The Nebular Hypothesis
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Questions and Answers

What is the name of the cloud of gas and dust where star formation begins?

  • Galaxy
  • Comet
  • Asteroid
  • Nebula (correct)

    • What causes the material in the nebula to collapse and form a star?

  • Gravity from nearby stars
  • Magnetic forces
  • Solar wind
  • Its own weight (correct)

    • What is the process called when particles in the debris cloud stick together to form larger objects?

  • Stellar formation
  • Galactic collision
  • Planetary accretion (correct)
  • Nebular hypothesis

    • What are the early stages of planetary formation called?

    <p>Proto-planets</p> Signup and view all the answers

    What did proto-Earth look like compared to Earth today?

    <p>Larger with no oceans or life</p> Signup and view all the answers

    Which process caused the heavier elements to sink toward the center of proto-Earth?

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

    What are Vesta and Ceres?

    <p>Asteroids in the asteroid belt</p> Signup and view all the answers

    How did the rocky planets of the inner Solar System, including Earth, form?

    <p>By pulling in more material through gravity</p> Signup and view all the answers

    Approximately how long ago did the rocky planets of the inner Solar System, including Earth, form?

    <p>4.6 billion years ago</p> Signup and view all the answers

    What happened to the proto-planets that became large enough?

    <p>They started pulling in more material</p> Signup and view all the answers

    What is the composition of proto-Earth described as?

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

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