Which is powered by Pu-238 - something which is in short supply nowadays, extremely expensive and pretty much inaccessible for a private company like Firefly who built the Blue Ghost lander.
> I don’t see why they didn’t use something that’s not solar
Cost. NASA paid Firefly $101.5M for the Blue-Ghost 1 contract [1]. Just the RTG used on the MSL Mars Lander cost $109M [2] (not counting the R&D costs).
> so they aren’t just littering the moon
Well, right now it is harming no one. They can only be seen by cameras orbiting the moon. If and when humanity starts living on the moon, these landers will go in museums and will no longer be "litter".
[1] https://spaceflightnow.com/2025/03/18/firefly-aerospaces-blu...
[2] https://en.wikipedia.org/wiki/Multi-mission_radioisotope_the...