Spindles and Swarming
A spindle is the primary craft of a swarm, which may consist of thousands to millions of them. Duplication counters the inevitable attrition of space travel. In addition to high velocity collisions with the gas molecules, the craft will be hit by cosmic rays – super high velocity protons accelerated in the explosion of a star to speeds just short of the speed of light. A human (still Earth-bound) explorer contributes many spindles to a swarm with each spindle containing a copy of their Personal Archive (PA), which acts on their behalf.