In an experiment begun in the 1960s, 100,000 gallons of the cleaning fluid perchloroethylene (C 2Cl 4 containing 2 × 10 30 atoms of 37Cl) has been used as the neutrino detector: a few chlorine atoms in the molecules of the cleaning fluid interact with solar neutrinos to produce argon. Because the reaction rate is very temperature dependent, astronomers have, in essence, a means of determining the true central temperature of the Sun to compare with the prediction of the Standard Solar Model. Measurement of the number of these neutrinos arriving at Earth then allows deduction of the number of reactions occurring in the core of the Sun. The boron to beryllium reaction in the proton‐proton cycle, however, has a special significance for scientists on Earth this neutrino is a high‐energy neutrino that has the greatest possibility of being experimentally detected at Earth via the reaction Originally believed to be massless, they travel essentially at the speed of light and have an extremely low likelihood of ever reacting again with other forms of matter. In searching for a means of testing whether these calculations were correct, scientists realized that the neutrinos coming from the nuclear reactions would allow such a test. Our understanding of the central region of the Sun is based solely on theoretical calculations. SETI-The Search for Extraterrestrial Intelligence.Internal Structure Standard Solar Model.Interior Structure: Core, Mantle, Crust.Minor Objects: Asteroids, Comets, and More.Origin and Evolution of the Solar System.
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