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Re: The Sun is a Variable Star

Subject: Re: The Sun is a Variable Star
From: Saul Levy
Date: Sun, 12 Mar 2006 22:47:17 -0700
Newsgroups: sci.astro
No, that's not what astronomers believe.  The planets, etc. didn't
form that way.

Saul Levy


On 12 Mar 2006 20:21:46 -0800, dlham@xxxxxxxxxxx wrote:

>dlham@xxxxxxxxxxx wrote:
>> Steve Willner wrote:
>> > In article <1141439913.023059.27090@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
>> >  dlham@xxxxxxxxxxx writes:
>> > > The reoccuring glacial periods are strong evidence that our sun is a
>> > > variable star that expands and contracts in fairly regular cycles.
>> >
>
>> > What is the mechanism causing this supposed solar variability?
>
>About four and one half billion years ago our protosun was slowly
>collapsing under the force of its gravity. As it did this, due to the
>immense compression caused by gravity it became extremely hot. Millions
>of degrees centigrade. The more compact it got the hotter it got. It
>was not alone in the sky, it was part of a community of stars and
>protostars. It lay in the outer regions of our galaxy, the Milky Way.
>It was being swept around the galaxy, along with its neighbors, at the
>tremendous speed of over 500,000 miles per hour. So far it had no
>satellites, (planets, moons, etc.) it's gravity had sucked in most of
>the star dust from its vicinity for hundreds of millions of miles in
>every direction.
>
>It was getting close to the temperature and pressure required for a
>nuclear fusion reaction to occur. The protosun was like a giant nuclear
>hydrogen bomb waiting to be detonated. When this tremendous event
>finally did occur the nuclear fusion reactions started up, in the
>hottest most dense area of the Sun.
>
>Tremendous amounts of radiant nuclear energy were suddenly created in
>the innards of the Sun. All of this newly released energy caused a
>sudden sustained violent increase in the pressure and temperature of
>the Sun creating tremendous chain reactions throughout its core region.
>These reactions did not just cause the star to began shining. It caused
>the Sun to violently explode, expanding to many times its former size.
>The explosion sent its matter hurtling at great speed outward in every
>direction in all sizes and speeds, both gases and molten solids, from
>the size of small particles to the size of the giant planets. Some of
>it was hurled out at such a great velocity that it was lost forever to
>other regions of the galaxy.
>
>Much of the debris eventually fell back, into the speeding Sun, if its
>trajectory was just right. Other debris, after it had expended its
>outward energy and had not broken free of the Sun's gravity, began to
>fall back toward the Sun. It fell back toward the Sun, but due to the
>Sun's great galactic speed and changing position always missed the Sun.
>This is the matter that became the planets, moons, comets, asteroids of
>our solar system. They are the survivors. It is like a skeet shooter
>who always aims directly at the clay pigeon, not allowing for a lead.
>His shot will never strike the pigeon simply because it will always
>have moved by the time the shot gets there. This is the basis on how
>our solar system works. It was a time of tremendous chaos in the solar
>vicinity, with all the matter rushing back toward the Sun from every
>direction crashing into each other and falling back into the Sun.
>
>After the initial explosion, as the Sun expanded outwards, it began to
>cool. As it cooled the area that a fusion reaction could take place
>became smaller and smaller. Some of the fusion reaction began to shut
>down. The expansion eventually came to a halt as the fusion energy was
>no longer powerful enough to sustain the outward momentum. Finally the
>Sun began to contract. This at first stabilized the fusion reaction and
>then as the gravitational contraction of the Sun continued, the area of
>the reaction again began to increase. When the Sun had contracted to
>the point where the area of reaction was again very large, the Sun
>again expanded and exploded outward with tremendous force sending more
>matter hurling out into space.
>
>This time however the expansion and explosion was not as powerful as
>the first event. This sequence of events happened again and again, each
>time the explosion was weaker and the expansion and contraction not as
>great as the previous event. This pulsation of the Sun gradually
>diminished after millions of Earth years, until it finally stabilized
>and became a mature star whose periodic variability spanned thousands
>of years. This periodic expansion and contraction is simply the
>balancing act of the Sun's gravitational and nuclear fusion forces.
>Eventually out of all this chaos and turmoil our orderly solar system
>began to emerge. The Sun had slowly settled down from its tremendous
>expansions and contractions of earlier times.
>
>The periodic expansion and contraction continues today at a very
>attenuated pace, causing our regularly reoccurring ice ages. The
>reoccuring glacial ages are about the only phenomena that spans a
>enough time to offer evidence of the long cycle variability of the sun.
>Scientists have also determined that the glaciers of our last ice age
>began receding at both poles simultaneously. This is additional
>evidence that the sun's variable solar radiation is the cause of the
>major glacial ages.
>
>
>Ref:  The Mind of Mankind - Chapt.12  - The Birth of the Earth
>
>> Don Hamilton

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