Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!hplabs!sri-unix.ARPA!gwyn@BRL.ARPA From: gwyn@BRL.ARPA Newsgroups: net.physics Subject: Re: Light Message-ID: <393@sri-arpa.ARPA> Date: Mon, 15-Jul-85 01:32:35 EDT Article-I.D.: sri-arpa.393 Posted: Mon Jul 15 01:32:35 1985 Date-Received: Wed, 17-Jul-85 05:21:47 EDT Lines: 13 From: Doug Gwyn (VLD/VMB)Gravity doesn't "bend light waves" according to general relativity; it warps the structure of spacetime. Light follows a null geodesic (think of it as the "shortest path") in all cases, so that it appears to take a bent path to an observer who does not take the space-time curvature into account. It is really meaningless to question whether the "speed of light is constant" without describing how units of space and time measurement are to be determined, since speed will be measured in such units. The concept of "null geodesic" is invariant with respect to any choice of units.