Asri-unix.1065
net.space
utzoo!decvax!ucbvax!ARPAVAX:C70:sri-unix!KATZ@USC-ISIF
Sun Mar 21 02:24:51 1982
Re: SPACE Digest V2 #135
Thought experiment in general relativity:

How do you define a straight line?  It turns out that a "straight" line
is the path of a light ray, so by definition, if you have a "straight" rod,
a beam of light would follow it.  However, "straight" here means a geodesic
which is a straight line in a curved space.


				Alan
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