[quote]Also more seiriously, are they all the same size?[/quote] Yes, ish. The original 12 Halos were 30,000km in diameter but could only fire in one direction. These Halos were all destroyed, save for the ring that came to be known as Installation 07 which was pretty much smashed into a planet to shed away a load of its mass so it could go into slipspace. The final 7 Halos are all 10,000km in diameter.