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Jan 24, 2021 at 16:28 vote accept ksousa
Jan 23, 2021 at 15:47 comment added ksousa Thank you. About the last point, I think indeed the gain on a nearby passing star would not be that great. But at least the supernova case would have potential to greater gain, as it tends to be farther, and thus to be more point-like. I will wait a bit before accepting, in case other answers show up.
Jan 23, 2021 at 15:00 history answered Anders Sandberg CC BY-SA 4.0