Dark matter, as its name implies, refers to a form of matter that does not interact with electromagnetic radiation and thus cannot be directly observed. Its nature and properties are still largely unknown, making it challenging to speculate on specific methods of storage.
However, based on our current understanding of dark matter, it is unlikely that it can be stored in a conventional vacuum. The concept of a vacuum typically refers to a space devoid of ordinary matter and photons, but it does not imply the absence of dark matter. Dark matter is thought to permeate the universe, including regions that are seemingly empty of ordinary matter.
Dark matter interacts gravitationally, meaning it exerts gravitational forces on other objects, including ordinary matter. However, since it does not interact electromagnetically, it is difficult to confine or manipulate using traditional means of storage.
Additionally, dark matter is believed to be distributed throughout the universe, forming halos around galaxies and clusters of galaxies. These distributions are on cosmological scales and not easily localized or contained.
Given the current lack of knowledge about the fundamental nature of dark matter, it is challenging to propose specific methods for storing it. Scientists are actively studying dark matter through its gravitational effects on visible matter, indirect observations, and particle physics experiments. As our understanding of dark matter improves, it may eventually lead to insights on how to manipulate or contain it, but currently, the storage of dark matter remains a subject of speculation and ongoing research.