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Could some black holes really be Dyson spheres?

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How do we know about specific black holes? Not about why they could exist, theoretically, but that this one (points at, say, Cygnus X-1) is a black hole? read more

That’s because even really massive black holes are way too small to blot out any stars. Stellar-mass black holes are a few kilometers across. Compare that to the Sun, which is about 1.4 million kilometers across. read more

If you mean Dyson spheres, then no. As explained expertly elsewhere in this topic. Dyson spheres are hypothetical only, whereas black holes are almost certainly real. A dyson sphere is a theoretical construct that surrounds a star and absorbs 100% of its energy. A black hole may have started as a star that collapsed under the eight of its own gravity. read more

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Should We Build a Dyson Sphere?
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