cometary collision hypothesis
Proposed in 1749 by Georges Louis Leclerc, Comte de Buffon,
the idea that a comet struck the Sun and broke off fragments which formed
the planets. This was the first version of the cataclysmic
hypothesis of the origin of the solar system. Buffon mistakenly assumed
that comets can be approximately as large as stars. The impact, he assumed,
was off-center so that not only were the planets thrown out into their orbits
but they (together with the Sun) were set spinning on their axes, some so
rapidly that they threw off additional material from which their moons were
made. A decade later, Kant put forward the
earliest form of the rival nebular hypothesis.
Related category
• PLANETS
AND MOONS
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