Speculation? Or can it be measured?
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By knowing how nuclear fusion works, and by measuring the surface temperature of the Sun along with knowing it's surface area and luminosity, you can calculate how much energy must be produced in the core. Through the study of Nuclear physics back in the 30's and 40's. Together with spectroscopic observations of the Sun allowing us to know it's chemical composition allowed physicists to confirm their predictions and accept their theories.
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well in truth it is speculation but the evidence leans towards what we currently claim happens in a star, nuclear fusion that is and studying physics has brought us to this point.
Neutrino is right, but this is still just a best guess based on our evidence (speculation) but it is enough evidence to assume without a shadow of doubt that he is right. it is possible that that theory could be thrown out the window tomorrow if somebody comes up with something that explains it all more clearly, but that is unlikely to happen.
Neutrino is right, but this is still just a best guess based on our evidence (speculation) but it is enough evidence to assume without a shadow of doubt that he is right. it is possible that that theory could be thrown out the window tomorrow if somebody comes up with something that explains it all more clearly, but that is unlikely to happen.
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We know the luminosity, mass, composition and neutrino flux from the sun via direct observation. We also observe small changes in the sun (sun quakes) all of these provide enough evidence for us to understand mostly what is going on in there.
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"Helioseismology" provides a great deal of detailed data about the interior of the Sun.
We can also directly observe neutrinos coming from the Sun's core.
We can also directly observe neutrinos coming from the Sun's core.
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The polish space program flew a manned mission to the sun years ago. but they did it at night so nobody got burned.