Re: Planetary defenses

>	What about something like the "Grand Cannon" from
>	the anime "Macross" (or the first third of "Robotech") ?
>
>	The barrel was several hundred feet in diameter, and
>	went miles into the ground.  The weapon beam was somehow
>	"steerable", like the electron beam in a computer monitor
>	cathode ray tube.  Raster-scanning the sky.
>
Correct me if I am wrong but didn`t something like that need mirrors in
orbit so it could be aimed? Once the mirrors went down wasn`t it kinda
of
ineffective?

			Scipio