No, not all luminous objects produce light. The term "luminous" can be misleading in this context.

Here's why:

* Luminous means "emitting or reflecting light."

* Light is a form of electromagnetic radiation that can be seen by the human eye.

There are two types of luminous objects:

1. Self-luminous objects: These objects produce their own light, such as:

* The sun

* Stars

* Light bulbs

* Fireflies

2. Non-self-luminous objects: These objects reflect light from other sources, such as:

* The moon

* Planets

* Mirrors

* A white wall

Therefore, while all luminous objects are visible, only self-luminous objects produce light. Non-self-luminous objects merely reflect light from other sources.