The California Nebula is lit by Menkib, a Class O star 200 LY away. This nebula stretches 100 LY across the heavens. Below is the NGC 1333 nebula.
HIP 12424, a small mining Imperial system, is the closest human colony. Between here and there lies 950 LY of blackness, peppered with several more nebulas including the Pleiades Nebula.