The proliferation of space objects is a rapidly increasing source of artificial night sky brightness

The population of artificial satellites and space debris orbiting the Earth imposes non-negligible constraints on both operations ground-based optical radio astronomy. ongoing deployment several satellite `mega-constellations' in 2020s represents an additional threat that raises significant concerns. expected severity its unwanted consequences is still under study, including interference information loss by streaks appearing science images. In this Letter, we report a new skyglow effect produced objects: increased night sky brightness caused sunlight reflected scattered large set bodies whose direct radiance diffuse component when observed with naked eye or low angular resolution photometric instruments. According to our preliminary estimates, zenith luminance light pollution source may have already reached $\sim$20 $\mu$cd m$^{-2}$, which amounts approximately 10 percent increase over determined natural sources light. This critical limit adopted 1979 International Astronomical Union for level not be exceeded at sites astronomical observatories.