Fusion
 
For centuries, humankind has looked at the stars, and for just as many years 
humankind has tried to explain the existence of those very same stars.  Were 
they holes in an enormous canvas that covered the earth?  Were they fire-flies 
that could only be seen when the Apollo had parked his chariot for the night? 
There seemed to be as many explanations for the stars as there were stars 
themselves.  Then one day an individual named Galileo Galilei made an astounding 
discovery: the stars were replicas of our own sun, only so far away that they 
seemed as large as pin pricks to the naked eye.  This in turn gave rise to many 
more questions. What keeps the stars burning?  Have they always been ...
 
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  Now replace those balls of clay with sub-atomic 
particles, and when they meld, release an enormous amount of energy.  This is 
fusion.  There is currently three known variations of fusion: the proton-proton 
reaction (Figure 1.1), the carbon cycle (Figure 1.2), and the triple-alpha 
process (Figure 1.3).  In the proton-proton reaction, a proton (the positively 
charged nucleus of a hydrogen atom) is forced so close to another proton (within 
a tenth of a trillionth of an inch) that a short range nuclear force known as 
the strong force takes over and forces the two protons to bond together (1). One 
proton then decays into a neutron (a particle with the same mass as a proton, 
but with no charge), a positron (a positively charged particle with almost no 
mass), and a neutrino (a particle with almost no mass, and no charge).  The 
neutrino and positron then radiate off, releasing heat energy.  The remaining 
particle is known as a deuteron, or the nucleus of the hydrogen isotope 
deuterium.  ... 
 
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 cluster, 
creating a carbon nucleus of six protons and six neutrons (2).  In this reaction, 
all of the heat given off is short-wavelength gamma rays, one of the most 
penetrating forms of radiation.  Each variety of fusion occurs depending on the 
size and age of the star. This will affect core temperature, causing the 
corresponding variety of stellar fusion. Now that fusion has been explained, 
one can learn how it occurs in the different star types.  All stellar bodies 
start off as protostars, or concentrations of combusting gases found within 
large clouds of dust and various gases.  These protostars, under their own 
gravity, collapse inward until it’s core has been heated and compressed ... 
 
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"Fusion." Essayworld.com. May 28, 2008. Accessed November 4, 2025. http://www.essayworld.com/essays/Fusion/84354.
 
"Fusion." Essayworld.com. May 28, 2008. Accessed November 4, 2025. http://www.essayworld.com/essays/Fusion/84354.
 
 
 
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