The intense lights of large cities provided by ever more powerful light sources is changing our natural environment. Light pollution confuses both humans and animals and has impact on our health. Astronomy is even more affected as it is becoming more and more difficult to observe the skies. Assoc. Prof. Dimitar Kolev from the Institute of Astronomy at the Bulgarian Academy of Sciences will clear up some of the issues surrounding light pollution.
Dedicated to the Centenary of the International Astronomical Union.