Abstract
The origin of the sun and planets has been reviewedfrom manifold considerations — nuclear, astrophysical, chemical and geophysical.Basically, there are two schools of thought: monistic, whichpostulates that the sun and the planets formed from some primordial systemof gases; and dualistic, which holds that the planets and meteorites hadgenesis in the sun's collision wtili another star. The extreme improbabilityof collision almost discards this hypothesis.The present day accepted theories are, hence, the monistic ones, andthe one particularly favored is the Dust — cloud hypothesis — that the suncondensed into a star due to the gravitational collapse of a massive interstellargas-cloud, and subsequently gave birth to planets as further evolutionof the cloud progressed. Studies of extinct radioactivities, within theframework of the above hypothesis, give clue to the early history of thesolar system and in particular indicate that the time interval between thestart of condensation and the formation of the meteorite parent-bodies isless six million years (Cameron). In this context the origin of stars from" globules " or proto-stars has been briefly discussed.A somewhat " exotic " theory of the formation of planets from thesun which hinged on the concept of secular decrease of the ' constant ' ofgravitation with the age of the universe (Dirac's hypothesis) has been discussed.The earth (with expansion of its volume) and other celestialbodies might provide empirical confirmation of the concept of diminishinggravitation — an important problem of general relativity. This new ideaof physics might revolutionise fundamental concepts in geology and geophysics.
Highlights
SUMMARY. — T h e origin of the sun and planets has been reviewed from manifold considerations — nuclear, astrophysical, chemical and geophysical
Our knowledge of the physics of interstellar space has at last come to a stage that we may formulate realistic theories of star formation. These theories have a bearing on the problem of origin of Solar system in that most of them postulate the formation of the sun and the planets together
The Russo-German astronomer Academician Otto Schmidt has developed a theory of the origin of Solar system of cold type, by the Sun's capture of an interstellar gas-dust cloud aimlessly wandering in the vast expanse of the Milk-Way
Summary
SUMMARY. — T h e origin of the sun and planets has been reviewed from manifold considerations — nuclear, astrophysical, chemical and geophysical. A somewhat " exotic " theory of the formation of planets from the sun which hinged on the concept of secular decrease of the ' constant ' of gravitation with the age of the universe (Dirac's hypothesis) has been discussed.
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