Answer:
Step-by-step explanation:
A luminous object is one that emits light, whereas a non-luminous object does not emit light on its own. The process of a luminous object becoming a non-luminous object can occur in several ways, including:
Running out of fuel: Many luminous objects, such as stars, emit light and heat as a result of nuclear fusion reactions that occur within them. However, these reactions require fuel to continue, and when the fuel runs out, the luminosity of the object will decrease until it is no longer emitting significant amounts of light.
Cooling down: Some luminous objects, such as incandescent light bulbs, emit light as a result of being heated to high temperatures. However, as they cool down, they emit less light and eventually become non-luminous.
Changing physical state: Some luminous objects, such as fire, emit light and heat as a result of a chemical reaction. When the fuel for the reaction is exhausted, the fire will extinguish and the object will no longer be luminous.
In summary, a luminous object can become non-luminous when it runs out of fuel, cools down, or undergoes a physical change that stops the process that was causing it to emit light.