Q114 (CAPF/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Astronomy and astrophysics

Which one of the following statements with reference to the Nebular Hypo- thesis for the origin of Solar System is correct?

The initiation of the nebular hypothesis can be considered as a diffuse, roughly spherical, slowly rotating expanding nebula

As a result of rotation and expansion, a disk is formed with matter concentrated in the centre

Expansion continues with the formation of the proto-Sun and the rings of material are left behind

The material in the rings get condensed and form the planets that revolve in orbits around the Sun

Result

Your answer: — · Correct: D

Explanation

The Nebular Hypothesis, proposed by Immanuel Kant and refined by Pierre-Simon Laplace in 1796, posits that the solar system originated from a slowly rotating, cooling, and shrinking cloud of gas and dust [2]. As the nebula contracted due to gravity, it began to rotate more rapidly to conserve angular momentum, causing it to flatten into a disk shape. While the central mass condensed to form the proto-Sun, centrifugal forces caused the nebula to shed successive rings of material [2]. These rings of gas and dust eventually cooled and condensed through accretion to form the planets and their satellites, which continue to revolve in orbits around the central Sun [1][2]. Modern revisions by Schmidt and Weizscker further detailed how friction and collisions within this disk-shaped cloud facilitated the formation of planets from the dust and gas [1][2].

Sources

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

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Which one of the following statements with reference to the Nebular Hypo- thesis for the origin of Solar System is correct?

Explanation

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