Based on this method, the sky will have the brightness of a 60W bulb that is 2.5 miles away. It is very faint, but not completely black.
The previous approach depended on the ultraviolet rays of a gigantic star whose lifespan was short, but it was unreliable because it could miss the faintest stars. The Blazar method is to measure light in all galaxies even if it is too small to detect. And people have been exploring measuring the background light of the galaxy before, but they have tried to study the light themselves and had to fight the interference from the galaxy.
At least not yet a completely accurate representation. In addition to the remaining 10% (important when dealing with all known universe), it does not include light that is dusted and reused in the infrared. Scientists have considered the dust, but it may be a problem to grab an old bladder to fill more data. As it is, currently available information can provide a much clearer picture of star formation in space, including the frequency of new stars.