What would a laser-powered sail starship look like from space?

From: Larry Klaes (lklaes@bbn.com)
Date: Mon Oct 18 1999 - 14:25:49 MDT

If a starship composed of a 1,000 kilometer-wide sail being pushed
at nearly the speed of light by a very powerful laser beam in the
terrawatt range was headed towards Earth - and was, say, less than
1/2 a light year away - how would it appear from our planet in
various spectrums and wavelengths, especially optical?

Thanks.

Larry

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