The sun is a star in the center of the universe. Research suggests that it was created by shockwaves from an exploding star or supernovae. It is made mostly of hydrogen and helium gases. It is not solid but does have an inner core. The energy radiated from the sun comes from the nuclear fusion of hydrogen into helium. The helium is turned to ash as 700 million tons of hydrogen burn every second. The inner core produces up to 15,000,000 K. ‘K’ represents a Kelvin, a unit measurement of thermal temperature. A 0 Kelvin is equal to a -273.15 degrees Celsius. 
It uses convection, a type of kinetic energy (use of motion and velocity to create acceleration) to transfer the heat from the core through the layers of its photosphere (the outside area where the gases are cool enough to be seen) and chromo sphere (the area above its photosphere) to its corona (the oblique surface we see). The energy in its core takes an estimated 1 million years to reach a photosphere that maintains a temperature up to 6,000 degrees Celsius. The pressure created on the sun is 340 times greater than that on earth.
