Abh technology

Antimatter production
The technology of antimatter production is ancient, but has been scaled up to astronomical dimensions. A fixed star's radiation is collected with solar batteries, then that energy is directed into a linear accelerator, that produces the antimatter. Accelerated elementary particles are accellerated at speed and smashed with enough energy to create small quantities of antimatter. Disc-shaped antimatter fuel factories (Joth) are very profitable. The antiprotons are collected into containers connected to the Joth. When a container was full, it was placed further into orbit as an independent asteroid to prevent cataclysmic meltdowns.

Artificial gravity
For the last 300 years it has become common for manors to carry artificial gravity devices.