abstract:A Dyson sphere is a hypothetical megastructure originally described by Freeman Dyson. Such a "sphere" would be a system of orbiting solar-power satellites meant to completely encompass a star and capture most or all of its energy output.
Thiswould include buildinghuge structures in space such as aDyson sphere or a star-girdling "ringworld," as envisionedin the 1970 Larry Nivensci-fi story of the same name.
The birth and death phases of stars, for example, are associated with heavy dust clouds that give off an infra-red signal which might resemble the swarm of artificial satellites constituting a Dysonsphere.
Any civilisation that has built a Dysonsphere will have to have been around for a long time, of course and in the very long run its star will start to change in unpleasant ways, ballooning to form a red giant.