The megastructure first proposed by physicist Freeman Dyson may be possible, but with very specific limitations.
Analyzing astronomical data for evidence of alien technosignatures could point us to extraterrestrial civilizations.
The man who envisaged that an alien race could build a 'Dyson Sphere' around its star has died aged 96.
Could an alien civilization build a large spherical energy-harvesting structure around a distant star ?
Three astronomers have been awarded a grant to assist them in locating Dyson Spheres in space.