- O
- ne of the earlier and popular arguments was by Germanphilosopher Immanuel Kant. MathematicianLaplace revised origin’s of earths theoryit in 1796. ItisknownasNebularHypothesis. The hypothesis consideredthat the planets were formed out of a cloud of material associated withayouthfulsun, which was slowly rotating.
- Later in 1900, Chamberlainand Moulton considered that a wandering star approached the sun. As a result, a cigar-shaped extension of material was separated from the solar surface. As the passing star moved away,
- the material separated from the solar surface continued to revolve around the sun and it slowly condensed into planets.
- At alaterdate,theargumentsconsidered of a companion to the sun to havebeen coexisting. These arguments are calledbinary theories
- In 1950, Otto Schmidt in
Russia and Carl Weizascar in Germany
somewhat revised the ‘nebular hypothesis’,
though differing in details. They considered that
the sun was surrounded by solar nebula
containing mostly the hydrogen and helium
along with what may be termed as dust. The
friction and collision of particles led to formation
of a disk-shaped cloud and theplanets were
formed through the process of accretion
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