pure hydrogen
If source you mean, fuel...then the answer is Hydrogen gas. The sun fuses to hydrogen atoms to create helium.
There's hydrogen at the core of the sun - that's the sun's main fuel - but earth's core is mostly iron and nickel.
The main substance in natural gas is methane, which is a colorless and odorless gas composed of carbon and hydrogen atoms. It is a clean-burning fossil fuel that is widely used for heating, electricity generation, and cooking.
The main substance in limestone is calcium carbonate.
main sequence stars all are burning though fuel at asteadyrate in there cores. with the proton+proton chain our sun is a main sequence star
The sun is currently in the main sequence stage. Next, it will evolve into a red giant as it depletes its hydrogen fuel and starts burning helium in its core.
no combustion dose not fuel the sun but the sun is fueled by a nuclear reaction known as fusion.
The sun is mostly made up of hydrogen, undergoing nuclear fusion to produce energy. It is estimated that the sun has used about half of its hydrogen fuel in its core, and it has enough fuel left to continue shining for about another 5 billion years.
Our sun, Sol, uses hydrogen for fuel.
A fuel is a substance which we get energy from. we usually burn fuels.
The main fuel source for the work of the cell is the mitochondria.
Fuel is formed when a substance burns up createing energy.