"Stars," Peridot swears weakly in this, the most confusing possible moment to use that exact phrasing. No sun, no stars... A life supporting planet somehow thriving off somewhere so deep in dark space that the residual light from other celestial bodies isn't even visible from there? They had stars, but then they disappeared? Did they all blink out at once?

She shakes her head, promptly moving on. "Your moons must be geo-luminescent in some manner, if they're capable of producing photons without there being a sun to reflect them from," she murmurs, rubbing her chin. "Or perhaps they have some quality that allowed them to store up light from a time when your system did have a sun, back when the planet and it's satellites were still in their primordial state."

Either way, an entire moon made up of naturally occurring light producing rocks? That would certainly be very useful to Homeworld. Good thing Peridot is no longer of a mind that's pro-colonization.