The Sun

 Kevin is a flat-earther...because of course he is 

SUN Tzu's Art of Weird 

One of the fun branches of the flat earth conspiracy is that of the fake sun. Through this, it is purported that NASA operates a gigantic sun simulator and that what you see up in the sky is not some huge gaseous fireball of a star (who would believe that!?) - it's a simulated light and heat source developed by the government, with its true intentions hidden. 

NASA's Dr. Gabe Lewis taking questions

NASA does, in fact, operate sun simulators to test both emerging technologies (e.g., solar powered collectors for spacecraft) and the effects of solar exposure on new materials. NASA does not, however, operate a fake sun that lights and heats our planet. 

Lens flares and other types of digital artifact are often provided as evidence of the sun simulator theory, but it's quickly debunked by overwhelming scientific evidence, basic physics, and the misinterpretation of NASA's actual scientific work. 

Sorry Kevin, the sun is real.