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The claim is that the greenish space makes dark objects appear more easily, and I know the "realism/fidelity" claims were clownishly wrong considering the space-fascist future features hand carts (that you have to buy with real world money!) and a star system loaded with 90s malls with hot dog stands, but something about making space itself a soupy greenish is... well... 
I wouldn't mind the greenish space at all and I wouldn't even mock it if it weren't for the big spending true believers declaring how much "fidelity" Star Citizen has and how "realistic" it all is and how "no shortcuts are taken" in the so-called simulation.