Fact 1: Nuclear reactions in stars causes stars to produce light.

Fact 2: An intense bright light produces a glare.

Given the two facts above, answer the question "What in stars cause stars to produce bright glares" with the following options: 
- energy of moving objects
 - nuclear reactions
 - direct energy
 - shining suns
 - bright activity
 - Chemical energy
 - moving moons
 - heat energy


 

  nuclear reactions       