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What effect does light have on us? Where does it come from? Astronaut Prof. Ulrich Walter gets to the bottom of electromagnetic radiation and explains how the Earth's excessive brightness affects us. Light pollution is a real problem, especially for astronomers - they need a dark night sky to explore galaxies with telescopes. Scientists from various institutes explain the phenomenon of light and why it is more than just brightness. ???? SPACETIME - all programs - • SPACETIME documentary series with Prof. Dr. Ul... ???? Our reports & documentaries - http://bit.ly/WELTdokus ???? Subscribe to the WELT YouTube Channel - http://bit.ly/WeltVideoTVabo #Spacetime #Light #Documentary