Somewhere, far away, if you believe what you read, there's a hole in the Universe. There's a region of space so large and empty, a billion light-years across, that there's nothing in it at all.
There's no matter of any type, normal or dark, and no stars, galaxies, plasma, gas, dust, black holes, or anything else.
There's no radiation in there at all, either. It's an example of truly empty space, and its existence has been visually captured by our greatest telescopes.
Journey through the Universe beyond the speed of light / What Is Beyond The Edge?