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by ben_w
870 days ago
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> if your fact were true, the universe would be a black hole. The mass of ordinary matter in the universe is 2×10^53 kilograms, which would have a Schwarzchild radius of 31.39 billion light years. The explanation from popular science communicators on this topic have never satisfied me. Your maths is correct for one cubic light year of butter. Proxima Centauri is 4.247 light years away, and that gives such a cube of water[0] a mass of 6.468×10^52 kilograms[1], which would have a Schwarzchild radius of 10.15 billion light years. [0] At STP, which isn't realistic at all [1] Close enough; I think it was Brian Cox who once joked that in cosmology it is standard practice to approximate π as 1. |
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