Visible light looks like this: https://www.adamblockphotos.com/ngc-3372-carina-nebula.html https://www.adamblockphotos.com/ngc-3372-carina-nebula.html But that

Visible light looks like this: https://www.adamblockphotos.com/ngc-3372-carina-nebula.html https://www.adamblockphotos.com/ngc-3372-carina-nebula.html But that's with a telescope and long exposure & image stacking. But still in RGB as humans would see it. I guess there would be a point that if you were not so far away, but still far enough away - it would light up the sky. This is emission nebula after all. BUt if you were in it, it would be so diffuse that you wouldn't know it... perhaps a weird glow if you were near some of the forming stars.