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Condensation Theory
97
Transcript
Sources:
http://zebu.uoregon.edu/~imamura/121/lecture-5/lecture-5.html
http://lifeng.lamost.org/courses/astrotoday/CHAISSON/AT315/HTML/AT31502.HTM
(c) SjaraLira2014
Robert Jastrow
This theory was presented by Robert Jastrow. He was the chairman of the Board of Trustees of the Mount Wilson Institute.
The condensation theory of planet formation
(not drawn to scale; Pluto not shown).
(a), (b) The solar nebula contracts and flattens into a spinning disk.
The large blob in the center will become the Sun.
Smaller blobs in the outer regions may become jovian planets.
(c) Dust grains act as condensation nuclei,
forming clumps of matter that collide, stick together,
and grow into moon-sized planetesimals.
(d) Strong winds from the still-forming Sun expel the nebular gas.
This theory stated that
a star or a sun started
from the compilation of
Hydrogen gas and atomic dust
(e) Planetesimals continue to collide and grow.
(f) Over the course of a hundred million years or so,
planetesimals form a few large planets
that travel in roughly circular orbits.
There are many theories on how the solar system or the universe or the galaxies were made. one of which is the Theory of Condensation.
This theory also proposes that the Moon and the Earth condensed individually from the nebula that formed the solar system, with the moon formed in orbit around the Earth
Star formation in our Galaxy occurs in Interstellar clouds
known as Giant Molecular Clouds .
The Solar System formed from a cold,
rotating clump inside a GMC.
The initial cloud was roughly 90 % hydrogen, 9 % helium
with small amounts
of everyting else (like iron, carbon, oxygen, ...).
This large swirling cloud that formed the Solar System
is referred to as the Solar Nebula .
Condensation Theory
As the cloud shrinks,
it starts to spin faster (in order to conserve angular momentum).
As the cloud spins faster, the centrifugal force causes it
to flatten into a disklike shape.
Eventually the central region of the solar nebula
forms the Sun while the planets form
in the disk of the solar nebula.
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