Early Theories of Earth's Origin
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Questions and Answers

Who first proposed the Nebular Hypothesis for the origin of the planets?

  • Abbe Georges Lemaitre
  • Chamberlain and Moulton
  • Pierre Laplace
  • Immanuel Kant (correct)
  • Which scientists revised the Nebular Hypothesis in 1950, proposing the formation of a disk-shaped cloud leading to planet formation?

  • Pierre Laplace and Immanuel Kant
  • Chamberlain and Moulton
  • Abbe Georges Lemaitre
  • Otto Schmidt and Carl Weizascar (correct)
  • According to the Nebular Hypothesis, how were the planets formed?

  • Out of a cloud of material associated with a youthful sun (correct)
  • As a result of the Big Bang Theory
  • Through a wandering star approaching the sun
  • From a solar nebula consisting mainly of hydrogen and helium
  • Who was the first to provide a theory on the origin of the Universe, also known as the Big Bang Theory?

    <p>Abbe Georges Lemaitre</p> Signup and view all the answers

    Who developed the Nebular Hypothesis in 1796, along with Immanuel Kant?

    <p>Pierre Laplace</p> Signup and view all the answers

    In what year did Chamberlain and Moulton consider that a wandering star approached the sun, resulting in the formation of a cigar-shaped extension of material that got separated from the solar surface?

    <p>1900</p> Signup and view all the answers

    What theory explains that the universe originated from a single violent explosion?

    <p>Big Bang theory</p> Signup and view all the answers

    At what stage does a star run out of hydrogen fuel at its core?

    <p>Red Giant</p> Signup and view all the answers

    Who provided evidence that the universe is expanding?

    <p>Edwin Hubble</p> Signup and view all the answers

    What is the name of the cloud of gas and dust in space, which is a star's birthplace?

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

    What is the stage of star formation where nuclear fusion is yet to begin?

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

    What is believed to be the core elements forming stars in molecular clouds in interstellar space?

    <p>Hydrogen and Helium</p> Signup and view all the answers

    Which stage represents an intermediate stage between a protostar and a low mass main sequence star?

    <p>T Tauri Star</p> Signup and view all the answers

    What happens during the main sequence stage of a star's evolution?

    <p>Fusing hydrogen atoms to form helium atoms</p> Signup and view all the answers

    What prevents the core from collapsing when helium fusion ends in a red giant star?

    <p>Fusion of carbon begins at the core</p> Signup and view all the answers

    What marks the transformation of a red giant star into a white dwarf?

    <p>The formation of a planetary nebula</p> Signup and view all the answers

    What leads to the formation of neutron stars after a supernova explosion?

    <p>Protons and electrons combine to produce neutron stars</p> Signup and view all the answers

    What causes the explosive death of a massive star?

    <p>The appearance of iron at the core</p> Signup and view all the answers

    What happens when a white dwarf stops emitting light?

    <p>It becomes a black dwarf</p> Signup and view all the answers

    What is the outer layer of gas and dust that is lost when a star changes from a red giant to a white dwarf known as?

    <p>Planetary nebula</p> Signup and view all the answers

    What are the inner planets also known as?

    <p>Terrestrial planets</p> Signup and view all the answers

    Which planet was previously considered a planet but is now classified as a dwarf planet?

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

    What is the main component of the thick atmosphere of the outer planets?

    <p>Helium and hydrogen</p> Signup and view all the answers

    How many moons does Mars have?

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

    What is the only natural satellite of Earth called?

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

    How long does the moon take for both its rotation and revolution around the Earth?

    <p>27 days and 7 hours and 43 minutes</p> Signup and view all the answers

    What is believed to be the result of the formation of the moon?

    <p>'Big splat'</p> Signup and view all the answers

    What is the outer layer of the Earth called?

    <p>'Lithosphere'</p> Signup and view all the answers

    What are the different layers of the Earth starting from the surface?

    <p>'Crust, mantle, outer core, inner core'</p> Signup and view all the answers

    What was the earth like during its early stages?

    <p>Barren, rocky and hot with a thin atmosphere of hydrogen and helium.</p> Signup and view all the answers

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