<P> The core of the Sun is considered to extend from the center to about 0.2 to 0.25 of solar radius . It is the hottest part of the Sun and of the Solar System . It has a density of 150 g / cm ( 150 times the density of liquid water ) at the center , and a temperature of 15 million kelvins ( 15 million degrees Celsius , 27 million degrees Fahrenheit ) . The core is made of hot , dense plasma ( ions and electrons ) , at a pressure estimated at 265 billion bar ( 3.84 trillion psi or 26.5 peta pascals ( PPa ) ) at the center . Due to fusion , the composition of the solar plasma drops from 68 - 70 % hydrogen by mass at the outer core , to 33 % hydrogen at the core / Sun center . </P>
<P> The core of the Sun is considered to extend from the center to about 0.2 to 0.25 of solar radius . It is the hottest part of the Sun and of the Solar System . It has a density of 150 g / cm ( 150 times the density of liquid water ) at the center , and a temperature of 15 million kelvins ( 15 million degrees Celsius , 27 million degrees Fahrenheit ) . The core is made of hot , dense plasma ( ions and electrons ) , at a pressure estimated at 265 billion bar ( 3.84 trillion psi or 26.5 peta pascals ( PPa ) ) at the center . Due to fusion , the composition of the solar plasma drops from 68 - 70 % hydrogen by mass at the outer core , to 33 % hydrogen at the core / Sun center . </P>
what is the approximate temperature at the center of the sun where nuclear fusion occurs
what is the approximate temperature at the center of the sun where nuclear fusion occurs
15 million kelvins ( 15 million degrees Celsius , 27 million degrees Fahrenheit ) .
15 million kelvins ( 15 million degrees Celsius , 27 million degrees Fahrenheit ) .