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Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Mikko <mikko.levanto@iki.fi> Newsgroups: sci.physics.relativity Subject: Re: The Universe Is Not A Sphere Date: Wed, 13 Nov 2024 12:19:27 +0200 Organization: - Lines: 19 Message-ID: <vh1uff$25dmo$1@dont-email.me> References: <fba4f14050cf7d238a88b4d7e3e88093@www.novabbs.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Wed, 13 Nov 2024 11:19:28 +0100 (CET) Injection-Info: dont-email.me; posting-host="3a27978ac66f72f225fabf4907fee778"; logging-data="2275032"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18ZdJItvjGNEXVPFktA4Jn0" User-Agent: Unison/2.2 Cancel-Lock: sha1:PLmQD8i/guGqktNCmDpNosu6G4s= Bytes: 1547 On 2024-11-12 21:35:12 +0000, LaurenceClarkCrossen said: > The Universe Is Not A Sphere So it seems. However, the part of the Universe we can see looks, except for minor irregularities, very similar to a small part of a large sphere. But so does a small part of an Euclidean space. > So, parallel lines on its surface do not meet. The path of a photon is a special kind of straight line. Light from certain quasars (e.g. SBS 0957+561) come to us over two paths so that the same qasars can be seen in two directions. This shows that two stright lines can cross twice. Somewhere between the two crossings they look parallel. -- Mikko