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I think we have to assume that "passing the horizon" is a subjective thing. Suppose they both can tell when they are passing their horizon. Alice blinks when she does. When Bob sees her blinking, he is passing his horizon. He infers that Alice's horizon is different from his.
I see one problem with this, though. Theoretically, it should be possible to put a fence very close to the horizon--a swarm of near-light-speed particles orbiting it. From Bob's perspective, he'd be hitting it while watching Alice hitting it at the same time.
Bartosz Milewski /
npub15c…wczp5
2024-11-24 16:58:29
in reply to nevent1q…clt4
Author Public Key
npub15c9gsd6d3cw0pyk8a2fkv248snan8vl8t0nhy5qhqvhxj20tch2swwczp5Published at
2024-11-24 16:58:29Event JSON
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"content": "nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqt76as6gjr7pzg0taz40e55smjjegmj89ud7g056aqed90hs7cynsacyu7x nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqknzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqaufa4k nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqdpcm4gtfv09u6rgv3v0kfp0pwq02mfcax7qljll2373npf90g74qn8cnse nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqm9rrh5l5j30l27z2hzjlxsxycdu2qg9z88yupe6gkccjzhj6k8yqjlj7pr \n\nI think we have to assume that \"passing the horizon\" is a subjective thing. Suppose they both can tell when they are passing their horizon. Alice blinks when she does. When Bob sees her blinking, he is passing his horizon. He infers that Alice's horizon is different from his.\n\nI see one problem with this, though. Theoretically, it should be possible to put a fence very close to the horizon--a swarm of near-light-speed particles orbiting it. From Bob's perspective, he'd be hitting it while watching Alice hitting it at the same time.",
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