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Q110 (IAS/1999) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Astronomy and astrophysics Answer Verified

Which one of the following scholars suggests the earth’s origin from gases and dust particles ?

Result
Your answer: —  ·  Correct: D
Explanation

Otto Schmidt’s 1950 revision of the Nebular Hypothesis explicitly describes the Sun as being surrounded by a solar nebula composed chiefly of hydrogen and helium together with dust; he and contemporaries proposed that planets, including Earth, condensed from this gaseous, dusty nebula through collisions and accretion [2]. The provided sources name Schmidt (and Weizsäcker) as revisers of the nebular idea, emphasizing formation from gas plus dust particles rather than alternative mechanisms. Given these citations, the scholar who suggested Earth’s origin from gases and dust particles is O. Schmidt (option 4) [2].

Sources

  1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 1: Geography as a Discipline > Origin of the Earth > p. 13
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Earlier Theories > p. 17
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