Dyson Spheres
Isaac Arthur1 HN recommender · recommended in 1 month, 2017-2022
838K views · 9 years ago · explainer · evergreen
Isaac Arthur examines Dyson spheres and swarms, including common myths and misconceptions. He covers uses such as interstellar travel, black hole generation, and computing large enough to simulate universes.
HN references it in threads on megastructures, Kardashev civilizations and Dyson sphere detection, and recommends the channel for in-depth futurist content.
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4 comments from Hacker News
There's plenty. The vast majority of the 'shell' would be solar concentrators - basically aluminium foil or something like it. You can make a LOT of that by dismantling a few asteroids, never mind a planet or two. Isaac Arthur's youtube channel goes into this in some depth (and is generally excellent, IMO). Here's an episode on Dyson Spheres: ▶ this video
See [1] and [2] where the idea of hiding a Dyson sphere is covered in depth. It essentially means breaking the laws of thermodynamics, specifically entropy. Hit and object with light from a star and it heats up. It radiates away that heat in a predictable way. [1] link [2] ▶ this video
If you're going to be using artificial habitats to have more living space, 416 is a very small number. ▶ this video
As huge as 416 Earths sounds, this is actually paltry for what's possible for a Kardashev 2 level civilization: ▶ this video