Pascal Bourguignon  <usenet@informatimago.com> wrote:
+---------------
| Now, observe how the relativity theory compresses the space
| in the direction of movement, while at the same time expanding
| the time of the voyager: ...
+---------------

Sorry, you have this backwards. Under Special Relativity voyagers
travelling close to C experiences subjectively *slower* time -- and
the only thing that prevents them from thinking they're travelling
faster than light is the apparent contraction of space in the direction
of movement.

+---------------
| ...the number processor cycles needed to do collision checking remains
| constant whatever the speed, with the trick of implementing relative
| time to each object.
+---------------

Again, backwards. The subjective time available to avoid a collision
with an object becomes *less* [and thus the number processor cycles
needed to do collision checking gets *larger*] because of both the
subjectively slowing of time and the contraction of space [itDoM].
This is a real navigational hazard to near-luminal flight.

[That, and the increase in hard radiation coming at you from your
direction of travel due to  visible light in front of you getting
Doppler-shifted up into the gamma...  :-(  ]


-Rob

-----
Rob Warnock			<rpw3@rpw3.org>
627 26th Avenue			<URL:http://rpw3.org/>
San Mateo, CA 94403		(650)572-2607