Current data indicate that the density of the intergalactic medium ranges from 10^-28 to 10^-26 kg/m³, while the density of cosmic voids is between 10^-29 and 10^-28 kg/m³, making them the closest known regions to “nothingness” in the universe. As a result, light from background galaxies can pass through these voids, allowing observers to detect galaxies located behind cosmic voids. However, astronomers have not detected galaxies behind cosmic voids, indicating that the light from those galaxies is being blocked. (Assuming cosmic voids contain dark matter, dark matter does not interact electromagnetically and cannot “block” light. Moreover, the existence of dark matter remains unconfirmed).

Why is this the case? This is the question I explore in my article “Black Hole, Black Galaxy, Cosmic Void”. I would greatly appreciate any assistance you can provide in addressing this phenomenon.