An official census at the accession of Julian Flavio Skamensis counted 523 inhabited star systems. This does not include the many tens of thousands of other systems explored but holding no self-supporting permanent population.
Note that I chose my words carefully there. I posted about the difficulties of interstellar censuses here.
OK, there were actually two notable absences.
Firstly, none of these worlds was originally fit to live on. Apart from Earth, which has long since been lost in the mists of legend, everywhere people live has had to be artificially made fit for habitation. Many worlds were terraformed - a slow and expensive process that eventually became the cause for immense conflict. Some, like Jemiyal, were simply converted into immense enclosed bases.
But there were no new Gardens of Eden, no Earthly twins. Just inhospitable balls of rock.
And that brings me to the most significant absence.
No alien life. Not even a microbe.
I chose not to populate my universe with a zoo of alien races. Yes, it's been fashionable for decades to pretend we aren't alone in our corner of the galaxy, but I suspect other intelligent life will turn out to be far spread in both time and space, and may be so removed from anything we have on Earth as to be possibly unrecognizable. This is a far cry from aliens in popular fiction, most of which, for some reason, turn out to be bipedal near-humanoids, or based on some Earthly body plan like insects or reptiles. That always makes me roll my eyes when I read it, so I decided to hold true to my beliefs.
Every person, plant, and animal in Shayla's world is ultimately of terrestrial origin.
Little green men, or large-eyed silvery men, are not part of the landscape.