Where did we come from? Before there was life there had to be
something to live on - a planet, a solar system. During the past
200 years, astronomers and geologists have developed and tested
several different theories about the origin of the solar system and
the nature of the Earth. Did the Earth and other planets form as a
by-product of a natural process that formed the Sun? Did the solar
system come into being as the result of catastrophic encounter of
two stars? Is the inside of the Earth solid, liquid or gaseous? The
three volumes that make up A History of Modern Planetary Physics
present a survey of these theories. Nebulous Earth follows the
development of the nineteenth-century's most popular explanation
for the origin of the solar system, Laplace's Nebular Hypothesis.
This theory supposes that a flattened mass of gas extending beyond
Neptune's orbit cooled and shrank, throwing off in the process
successive rings that in time coalesced to form several planets.
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