"Microstar" is a next-generation propulsion system that harnesses the energy of artificially stabilized miniature stars - compact fusion cores engineered to replicate stellar conditions on a micro scale. These microstars serve as ultra-dense power sources, enabling spacecraft to achieve sustained high-velocity travel across interstellar distances.
Reminds me of Baxter's "Raft" only with a more modern, hard-scifi sleekness as opposed to the more naturalistic aesthetic he wanted.