Path: csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!border2.nntp.dca1.giganews.com!Xl.tags.giganews.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 23 Nov 2015 13:16:33 -0600 Message-ID: <56536610.51BD@ix.netcom.com> Date: Mon, 23 Nov 2015 11:16:32 -0800 From: The Starmaker Reply-To: starmaker@ix.netcom.com X-Mailer: Mozilla 3.04Gold (WinNT; U) MIME-Version: 1.0 Newsgroups: sci.physics Subject: Re: Without Einstein it would have taken decades longer to understand gravity References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 30 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 45.49.183.72 X-Trace: sv3-AZ2g9HILvbmj4wTwdtChEsu4vk7mY4ccohyNZaamRNev+kxGUeJY16FDy0ObC30X3CgCheEBApcm0N7!B7YLwiso05tAj8+7kDXTu6YUJ3LdREhTC/xs411fQHH50bTeSKkcZPTSBYTUBrYNFjXWy9DkY/Sv!LggCU1Zl X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2407 Xref: csiph.com sci.physics:534872 Sam Wormley wrote: > > Without Einstein it would have taken decades longer to understand gravity > > http://phys.org/news/2015-11-einstein-decades-longer-gravity.html > > > To describe curved space-time, Einstein called upon the earlier work > > of Bernhard Riemann, a 19th century mathematician. And with the help > > of his friend Marcel Grossman, also a mathematician, Einstein spent > > several exhausting years learning the mathematics of curved spaces, > > or what mathematicians call "differential geometry". As Einstein > > commented, "compared with understanding gravity, special relativity > > was mere child's play". > > > > Now Einstein had the mathematical tools to finalise his theory. His > > equivalence principle stated that an accelerating reference frame is > > equivalent to a gravitational field. From his geometrical studies, he > > believed the gravitational field was simply a manifestation of curved > > space-time. Hence, Einstein could show that accelerating frames were > > represented by non-Euclidean space. > > > > -- > > sci.physics is an unmoderated newsgroup dedicated > to the discussion of physics, news from the physics > community, and physics-related social issues. Gravity is 'just a theory'....there is no proof or fact that there such a thing as ...Gravity.