RE: Planetary defenses

Depends on the genre as well:

Energy Shields and Hyper Missiles with the
moon as a battle planetoid (mutineers moon etc)

Energy Shield, Ion Cannons (star wars)

Orbiting SML's and HBW (b5)

Bugger all (star trek - as vger (STTMP) and the probe (TVH)
	    had no real opposition)

Plasma Squirts (STtoopers)

tim jones
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