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..and then there is the question about a small object which is spherical under its own gravity (perhaps because it started liquid and then solidified), but is then struck so that it shatters.If it melted, it would reform as a distorted sphere like Saturn's moon MimasIf it didn't melt significantly, it would have a very irregular shape.
Only one billion Lightarrow? Why, I've heard of billionaires having more?
although if it is spinning then there would be frame dragging involved, which locally would make a space no 'flat' at all?