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This is a setting creation exercise meant to create a setting useful for a space travel RPG.
Earth exists in the setting, but it is burnt out, having been “used up” ages ago. Few planets have the sorts of resources that Earth once had.
There are remains of non-human sapients, but no living examples have been found. Most never made it off their homeworlds, with the exception of one group, the one that built the gates (see below). But no homeworld has ever been found for these beings.
There are several species of Terran fauna that humans have uplifted to full sapience.
There are multiple types of FTL drives, each serving various purposes.
There are two main methods of instantaneous transit over large distances.
Gates have been found created by the beings referred to as the Builders for having built them. Humans have not been able to replicate this
Even small craft may have FTL drives, but any FTL drives that are not Point-to-point are only up to a few multiples of C, rendering them highly inconvenient for transit between systems, or even to very distant companions. Most use of such FTL is for going from place to place inside of systems where there are no gates built.
These drives vary in some specifics, but all have the following in common:
All such drives create a hyperspace bubble around the craft. This bubble places it out of contact with all normal matter, but energy can pass in and out of the bubble.