I don't believe that there are Dyson-Spheres out there. I as a non-physics expert can't imagine such construction to be any stable with all the materials we know of. Not even carbon nano tubes, graphene and other variations. We I could imagine Dyson swarms around stars but not in that amount mostly depicted by sci-fi documentary aso.,(reply>), @Tom Smith Yes right!👍<br><br>The other thing that makes a Sphere mostly impossible is how manage that huge and heeeeeaaavy Sphere should be centered around the star that is in its inside. You would loose the x time amount of energy you get to collect from the star to have this system in alignment. Not to mention how to manage that much power. I really can't imagine how even a far advanced species could move either a star and/or the sphere around it.,(reply>), the word dyson sphere is misleading. Almost no serious person who mentions it is refferring to a single contiguous shell around a star, but rather a collection of objects collecting energy. They should change the name to "Dyson Swarm", since thats more in line with what is meant.