If there were no light, ordinary matter would still exist. Ordinary matter refers to the matter we are familiar with, such as atoms, molecules, and all the objects we encounter in our everyday lives. This matter would continue to exist even in the absence of light. Light is a form of electromagnetic radiation, but it is not necessary for the existence of ordinary matter.
On the other hand, dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation in a detectable way. Its presence is inferred through its gravitational effects on visible matter and the large-scale structure of the universe. Dark matter is thought to make up a significant portion of the total matter in the universe, but its exact nature and composition are still unknown.
If there were no light, dark matter would still be present, as its existence is independent of light. However, it's important to note that dark matter is not directly observed or detected through light-based observations. Instead, its presence is inferred through its gravitational influence on visible matter and the universe as a whole.
Therefore, in the absence of light, ordinary matter would remain as it is, and dark matter would also persist, although it would not be directly observable through light-based measurements.