From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mail.toke.dk; spf=pass smtp.mailfrom=evslin.com; dkim=pass header.d=evslin.com; arc=none (Message is not ARC signed); dmarc=none Received: from smtp118.iad3b.emailsrvr.com (smtp118.iad3b.emailsrvr.com [146.20.161.118]) by mail.toke.dk (Postfix) with ESMTPS id 7BDEF9A0BEB for ; Thu, 20 Nov 2025 21:44:38 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=evslin.com; s=20220608-p431o605; t=1763671477; bh=YYEYBI4NB/5zl1dVQl2GifxpVVEnJhawpLvyZn85ENs=; h=From:To:Subject:Date:From; b=fhJOJSC7rsrjW9dnBbPj7tQZwMQhRP0TG03ru94l3EhifuJRwB6yyUAPxhEz4g5G0 dif26GkeeX9MbjhkTavpgZ3t1U5Bon6Rt4GDwwxzm/GtDP+17AyrXpV0q8r3dxR3pt Rlm/ACE2Xow5LKNY7vTWRl6jAFD49zYjntoaY5XA= X-Auth-ID: tom@evslin.com Received: by smtp15.relay.iad3b.emailsrvr.com (Authenticated sender: tom-AT-evslin.com) with ESMTPSA id 415F1C02C6; Thu, 20 Nov 2025 15:44:36 -0500 (EST) From: To: "'David Lang'" , "'Michael Richardson'" Cc: References: <1c49e0fa-f2ee-4d89-87f5-bc7f5538e77d@sewingwitch.com> <30692.1763668809@obiwan.sandelman.ca> <13r9sopo-6n7r-r166-sno0-8s274q82qp87@ynat.uz> In-Reply-To: <13r9sopo-6n7r-r166-sno0-8s274q82qp87@ynat.uz> Date: Thu, 20 Nov 2025 15:44:35 -0500 Message-ID: <13a901dc5a5e$7c059ac0$7410d040$@evslin.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQGRI9DcHBNjij1AwL7127YFHVSbrgJj0QKXAcFUQQsCGT61MAEv2bIsAStRIbG1TaVnsA== Content-Language: en-us X-Classification-ID: 881f8b12-a905-4bf6-a42c-a6d703b4995b-1-1 Message-ID-Hash: IUE7E64HPCFG6XSZ2EOBWIALO7LMGWX3 X-Message-ID-Hash: IUE7E64HPCFG6XSZ2EOBWIALO7LMGWX3 X-MailFrom: tom@evslin.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list Subject: [Starlink] Re: AI IN SPACE: Post from Elon Musk (@elonmusk) List-Id: "Starlink has bufferbloat. Bad." Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Just to speculate out of my depth: Although the first generation of orbiting and probably lunar datacenters will probably be made from components which were designed for use on earth, the second generation may not be. Waste heat comes mainly from electrical resistance. But there is little waste heat with superconductivity. Is it possible to design circuits meant for use only in space which are largely superconducting so that both the energy demand is way down and there is less heat to dissipate? Fiber is a wave guide in a scattering atmosphere. Do we need fiber between lasers and receptors in space for short distances when we don't need the signal to go around corners? Fiber adds impedance and distortion and increases the transmit power needed. Is there a battery-like chemical reaction powered by extra heat which reverses in shade and uses the chemically-stored heat to generate electricity? How much better (or differently designed) can chips be when manufactured without either gravity or contamination? Fun to think about what constraints will be gone and what that might mean. -----Original Message----- From: David Lang via Starlink Sent: Thursday, November 20, 2025 3:12 PM To: Michael Richardson Cc: David Lang ; starlink@lists.bufferbloat.net Subject: [Starlink] Re: AI IN SPACE: Post from Elon Musk (@elonmusk) Michael Richardson wrote: > Which is to say, they satellite is always getting heated from one side > :-) > > For non-sun synchronous LEOs, does the dark time help with radiant cooling? > I assume some satellites' cooling profile are designed around the > assumption that they will be dark for a portion of the orbit? when you are in sunlight, you can radiate in 5 directions (except the tiny slices that face the earth and moon) when you are not in sunlight, you have to operate on battery power if you are in a 90 min low orbit, you spend just over 33 min in shadow each orbit. When you are in geosynchronous orbit (24 hour orbit) you only end up in the shadow for a few months each year (late February to mid-April and late August to mid-October) and then only for about 70 min out of each 1440 min orbit so no, satellites do not rely on being in the shadow for their cooling David Lang _______________________________________________ Starlink mailing list -- starlink@lists.bufferbloat.net To unsubscribe send an email to starlink-leave@lists.bufferbloat.net