Saac Newton believed that light was made of

tiny particles

Explanation:

In his theory, Newton stated that light was composed of very tine particles having a certain mass and these particles followed the law of physics just like any other object having mass would.

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.