Why Don't Stars Burn Out Like Wood?

Imagine a giant campfire in the sky. Just like wood turns into ash and smoke, stars turn hydrogen gas into helium energy. But this star fire is super strong! The huge weight of the star pushes everything down tight, making it very hot inside. This heat makes the star glow bright yellow or blue. It burns steadily for a long time because there is so much fuel left.

A star like our Sun has enough hydrogen to last about 10 billion years. That is a very long time! When all the wood runs out, the campfire goes dark. Stars do the same thing when their fuel gets used up.