-----BEGIN PGP SIGNED MESSAGE----- Ack. Corrections. In article <483l88$1f0@yage.tembel.org>, I wrote:
You could do this with a reflector $ct/2$ metres away, assuming your opponent and you are in the same location.
Also assuming your attacker cannot use the information until he can get it back to Earth, or else he could just race towards the reflector and catch it on the way back.
the diameter of the solar system is about 5.4 light-hours
The *radius* of the solar system is about 5.4 light-hours. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBMKWYqeyjYMb1RsVfAQEkAQP+Id4Y9uJhwC3ywRDMAeCMh3XDHnznKN7V njNlvkf8hQ9jLVPBbI5rBVRS4ddfmm9SXu9yiTYGpm1Jx29OIYf4Ew4GxUYKFpJc qM95K9DVRtNuYa2ZHMRVX+znV+der+DxPW8tFt9UXL+PpRfygCPgJJD5CGTcDD8L 5YRZUSthj+U= =tQ2G -----END PGP SIGNATURE----- -- Shields.