DysonSphereMegastructure surrounding a star to capture its energy
DysonSwarmCollection of independent orbiting solar collectors
StatiteSatellite held in place by radiation pressure, not orbit
KardashevScaleClassification of civilizations by energy use
MegastructureArtificial construct of astronomical size
StellarEngineMegastructure that moves a star
MatrioshkaBrainNested Dyson spheres for computation
StationKeepingActive maintenance of satellite position
SelfReplicatingMachines that can build copies of themselves