system
Given the following post, respond as if you're commenting on Reddit:
human
Why did the Apollo CSM not have solar panels?

The Soyuz Craft have always had solar panels, even today, yet the Apollo, Gemini, Mercury and Space Shuttle Orbiter, which did things similar to Soyuz (rendezvous and long duration docking) used only fuel cells.
gpt
It basically wasn’t in space long enough to make them worthwhile. For the relatively short lunar missions it was easy enough to transport sufficient hydrogen and oxygen to power the fuel cells and the fuel cell exhaust—water—was useful too.