NacNack, I have a point of order. You say your fucking giant battleship warrior thing has a really big gun that shoots things real fast. However, I don't think you understand just how big the things are, and how fast they are going.
I roughly crunched the numbers, so accuracy may not be the best, but I came out with: 1.0189e^15 tonnes of TNT. Over one PETATONNE OF TNT. In joules that is 4.2629e^24J, or 4 yottajoules. That is a fucking silly amount of energy. That is 10 times the amount of energy present on earth in the form of Uranium 238. It is in the same ballpark as the TOTAL AMOUNT OF SUNLIGHT THAT HITS THE EARTH EACH YEAR. It is 100 times the amount of energy present in all the fossil fuels in the world today.
So, to summarize: fucking god fucking damn you have made the most fucking stupid gun ever. You would need 23682777.78 kilograms of antimatter [in anti-hydrogen] per shot [not to mention the equivalent amount of real-hydrogen to react with]. It would fuck ANYTHING in the eye. That gun would destroy planets. Like, atomize them. Forever. What the fuck, why would anyone build that ever. Also, it is fucking impossible to get that much energy, and that much energy is pointless.