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- Newsgroups: sci.physics
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!ncr-sd!ncrcae!hubcap!jtbell
- From: jtbell@hubcap.clemson.edu (Jon Bell)
- Subject: Re: Curved space?
- Message-ID: <1992Dec21.052433.8033@hubcap.clemson.edu>
- Organization: Presbyterian College, Clinton SC
- References: <BzL73K.9xr@usenet.ucs.indiana.edu> <BzL7As.A81@usenet.ucs.indiana.edu>
- Date: Mon, 21 Dec 1992 05:24:33 GMT
- Lines: 19
-
- In article <BzL7As.A81@usenet.ucs.indiana.edu> mkohlhaa@silver.ucs.indiana.edu (mike) writes:
- >I've heard "the shortest distance between two points is not necessarily
- >a straight line." I'm not as knowledgable about physics as most of you
- >probably are, and would like a explanation to this interesting
- >statement.
-
- Depends on how you define "straight." The shortest path between two points
- on the Earth's surface is generally not a straight line if you're using a
- map based on the Mercator projection, but _is_ a straight line in some other
- projections.
-
- A better analogy as far as curved space-time is concerned (which is probably
- what you're thinking of): Suppose you have a flat plain with a mountain in the
- middle. If a straight-line path between two points on the plain happens to
- pass over the mountain, a shorter path is probably one which "bends" to
- skirt the mountain.
-
- Jon Bell / Dept. of Physics & C.S. / Presbyterian College / Clinton SC
-
-