The possibility that there might be "dark" or "hidden" matter blocking our view of other galaxies is an interesting concept, but it is not supported by current scientific understanding. Our observations of the universe suggest that dark matter, which is a form of matter that does not interact with light or other electromagnetic radiation, is distributed throughout the universe rather than localized in a way that would block our view.
Dark matter is inferred from its gravitational effects on visible matter and the large-scale structure of the universe. It does not emit, absorb, or reflect light, which makes it difficult to directly observe. However, its presence is detected indirectly through its gravitational influence on visible matter, such as galaxies and galaxy clusters.
The current understanding is that dark matter is distributed more uniformly than visible matter in the universe, forming a gravitational scaffolding that helps galaxies and galaxy clusters to form and hold together. It does not selectively block light or prevent us from observing other galaxies.
The reason we have limitations in observing distant galaxies is primarily due to the finite speed of light and the expansion of the universe. Light from distant galaxies takes time to reach us, and the farther away a galaxy is, the longer its light takes to reach us. Additionally, the expansion of the universe causes the light from very distant galaxies to be redshifted, shifting their light into longer wavelengths and making them harder to observe with certain instruments.
While our view of the universe is limited in some ways, current scientific understanding does not suggest that dark matter blocks our view of other galaxies. However, it is worth noting that scientific knowledge is constantly evolving, and new discoveries may reshape our understanding of the universe in the future.