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revised How does universal inflation fit with the Planck length?
Clean up spelling of Max Planck's name.
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comment What would a rotating black-hole look like to a “geo-stationary” observer orbiting the black hole
@Jus12, no, there is no reason that one couldn't have a very small black hole suitable for study in a laboratory (if you can keep it from falling through the floor), or one that doesn't happen to be rotating very fast. I hadn't thought of that.
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answered What was the most distant supernova spotted by a amateur astronomer until today?
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answered What would a rotating black-hole look like to a “geo-stationary” observer orbiting the black hole
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comment Christoffel symbols and affine connection
More helpfully, perhaps: here