The moon does not fall to earth because of friction

force of gravity

Explanation:

The gravitational force between Earth and the moon is strong. But the force is not strong enough to pull the moon towards us. That's why the moon doesn't fall on Earth.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.