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Excerpts from netnews.sci.physics: 6-Oct-92 Re: How do you draw a
strai.. Aephraim Steinberg@physi (694)

> (Besides, if the string has any mass and is in any gravitational field
> whatever, then any finite tension will still leave it a catenary, just
> a straighter and straighter one.  I believe the question was one of
> principle.)

Nope. Stretch it vertically. 

You still need a perfectly spherical planet, or at least one with the
appropriate symmetry around where you're doing the experiment.

A laser in a vacuum should also be counted as a straight line,
regardless of the gravitational field. It follows a geodesic, and what
does "straight" mean if not a geodesic? :-)

--Z

"And Aholibamah bare Jeush, and Jaalam, and Korah: these were the borogoves..."