"Lunar" is an adjective, a descriptive word, not a noun.
It also doesn't have to apply to Earth's moon, but could apply to the moon of any planet.
I was under the impression the specific use of the phrase 'Lunar' is meant to distinguish Earth's Moon from others. Like how the phrase 'Terra' is meant to distinguish our planet from other 'earths'
By the way, and this is for nx1701g...
When did the writers say that later characters are still intact in the movie's universe/tiimeline?
I'd also be interested in this.