it has not been firmly established that there is a galaxy in the universe completely devoid of dark matter. Dark matter is a form of matter that does not interact with light or other electromagnetic radiation, making it challenging to directly observe. Its presence is inferred through its gravitational effects on visible matter and its impact on the large-scale structure of the universe.
Most galaxies, if not all, are believed to contain dark matter. It is thought to play a crucial role in galaxy formation and the dynamics of galaxies. Dark matter provides the gravitational glue that holds galaxies together and helps explain their observed rotational speeds.
However, there have been studies and observations suggesting the existence of a few galaxies that appear to have very little or no dark matter. These galaxies are referred to as "dark matter-deficient" or "low-mass dark matter halos." One well-known example is the galaxy NGC 1052-DF2, which was discovered in 2018 and has been the subject of ongoing research and debate. Some scientists argue that these galaxies could be exceptional cases, while others propose alternative explanations or modifications to our understanding of dark matter.
It's worth noting that scientific understanding is constantly evolving, and new discoveries may shed further light on the presence or absence of dark matter in galaxies. So, while the current consensus is that most galaxies contain dark matter, the question of whether there are galaxies completely devoid of dark matter remains an active area of research.