JUELICH, GERMANY - MARCH 21: Employee, Volkmar Dohmen, stands in front of Xenon arc lamps that form a large artificial sun at the German Aerospace Center (DLR) on March 21, 2017 in Juelich, Germany. A large artificial sun called Sunlight can emit up to 10,000 times the intensity of the sun's light. PHOTOGRAPH BY Picture-Alliance / Barcroft Images London-T:+44 207 033 1031 E:hello@barcroftmedia.com - New York-T:+1 212 796 2458 E:hello@barcroftusa.com - New Delhi-T:+91 11 4053 2429 E:hello@barcroftindia.com www.barcroftmedia.com (Photo credit should read Picture-Alliance/Barcroft Images / Barcroft Media via Getty Images)