marxilaisuus th purkaus dyson sphere wikipedia sukututkimus Setä tai herra suihku
File:SphereC60.jpg - Wikipedia
Dyson sphere | Kardashev Scale Wiki | Fandom
Finding Alien Megastructures Around Nearby Pulsars - Universe Today
internal consistency - What reason would an alien civilization have for building a Dyson Sphere (or Swarm) if cheap Nuclear fusion is available? - Worldbuilding Stack Exchange