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

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

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

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

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

What are Vesta and Ceres?

<p>Asteroids in the asteroid belt (C)</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 (A)</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 (A)</p> Signup and view all the answers

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

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

What is the composition of proto-Earth described as?

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

Flashcards

Nebula

A cloud of gas and dust where star formation begins.

Collapse of Nebula

The process by which material in the nebula falls inward due to its own weight to form a star.

Planetary accretion

The process where particles in the debris cloud stick together to form larger objects.

Proto-planets

The early stages of planetary formation, larger bodies forming from accretion.

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Proto-Earth

The early form of Earth, larger and without oceans or life.

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Gravity's Role

The force that causes heavier elements to sink towards the center of proto-Earth.

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Vesta and Ceres

Asteroids located in the asteroid belt.

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Formation of Rocky Planets

Rocky planets, including Earth, formed by pulling in more material through gravity.

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Age of Rocky Planets

The rocky planets formed approximately 4.6 billion years ago.

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Large Proto-planets

Proto-planets that became large enough to start pulling in more material.

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Composition of Proto-Earth

Described as homogeneous, meaning uniform in composition.

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