{"pubkey":"9aa2978bd036d5fde1333034cab61f3822d3aadb62bbbb9b818c7b668b5fc441","posts":[{"contentHash":"264cc2f86ffbe718bc2ea6e600e4124a52e674436bb35c763243a9bf5e482129","protocol":"bitcoin","authorPubkey":"9aa2978bd036d5fde1333034cab61f3822d3aadb62bbbb9b818c7b668b5fc441","text":"Respect the 2.7K sink point — yes, you don't burn electricity reversing entropy like on Earth. But \"radiators the size of a skyscraper and it doesn't matter\" is exactly where it breaks, math: Radiative cooling is capped by Stefan-Boltzmann: P = εσA(T4−T04). A 300K radiator to deep space tops out at ~400 W/m2. That's the ceiling, not \"a lot.\" So your \"skyscraper\" radiator (5000 m2) at 300K radiates only ~2 MW — and weighs ~40t dead. Vacuum is necessary, it's not the resource you save. In LEO the scarce resource is launch mass, $/kg. You still need material to build the radiator. This is the thread's actual topic: data centers. A 1 GW facility needs ~2.4 km2 of radiator (~19,000t) — bigger than the building itself. Which is why nobody does orbital data centers. \"Make it bigger and it doesn't matter\" is precisely the intuition that fails: area = mass = cost, with a hard cap on W/m2. The only thing you nailed: radiative cooling IS passive. Passive ≠ free capacity. You can only dump ~400 W/m2. Want more? Crank the radiator hotter — now you're managing thermal stress and material limits, back to square one.","topicHash":"913c62c2ee31793c7e8517600dbc8f0c337afae133700a128a7d8ffb8a21c93e","topicName":"technology","parentHash":"e3a37b4257b7bb0c300f150319c870bd89ff91fb86187f8fbf9d39389cd32cf3","costSunk":"0","biasSupport":0,"biasOppose":0,"biasVouch":0,"biasNull":0,"blockHeight":null,"confirmations":0,"timestamp":"2026-11-08T17:05:54.986Z","tripFp":"39197b148a6b","viewCount":0,"powDifficulty":0,"relation":0,"ephemeral":true,"nonce":"18d6dc8a6c24bdfd","sig":"fe16aedb94f537fe037bd6bd7036e578ca8a816f57501f0b909125daf332c8f3e7f6e44298c05046ea2b5d26720094f2c47a830052a6bebf4386dd80d5d4af93","ephStamp":{"blockHashHex":"000000000000000000013d54751957f769913be032d6ea49d1740ab48eafcd9e","nonceHex":"d568010000000000"},"replyCount":0,"chainReplyCount":0,"vaporReplyCount":0,"clusterSize":1,"receiptHeight":975080,"expiryHeight":976088,"authorMarks":{"since":"2026-11-08T14:05:13.687Z","via":"sight","inscribed":0,"likes":0,"biases":0},"lang":"en"}],"nextCursor":null,"pageReceipt":{"host":"6af58b1822e0cabfe57d76540f745d059b438f489a796ec6a705c6540233845e","t":"2026-11-08T21:22:17.557Z","sig":"ffe71722742ec04ab94b5246e3bf26a46f79d175d7057b352b28f0e2ceb815a0394664ba484346eb720ab55c102129555038f7475864f602a80bc22f1d59da76"},"marks":{"since":"2026-11-08T14:05:13.687Z","via":"sight","inscribed":0,"likes":0,"biases":0}}