I am not joking at all. In fact, I am dead serious. These are real facts. Super Heated plasma is extremely hot, enough to melt through titanum and raw steel.
Lightspeed travel is also impossible. Its a common fact.
Oh ok, so we'll do this one at a time.
I think spaceship to spaceship warfare will include firing super-heated peices of plasma at other ships (It can be done!).
Enlighten me as to how one fires a 'piece' of plasma. I'm not saying it can't be done, but I've heard of no experiments regarding the controlled emission of weaponized plasma.
Missles will have to be ruled out because the boom would require oyxgen.
Okay, first... many explosive chemicals can burn or react without the presence of atmospheric oxygen. Some of them have the oxygen in the substance itself. We even include the oxygen with rocket fuel so that it can burn in space, as far as I know. That aside, why would we use chemical explosives at all? I would go with a fission or fusion based reaction in missiles myself. We already have the technology to do both.
I have heard of Railguns, but I do not have enough proof to support that so I will not try.
I touched on 'railguns' (i.e. kinetic weaponry) earlier. Beyond a certain (fairly short) range, a kinetic kill vehicle is simply too inaccurate to be useful. It generally has none of the in-flight course correction or guidance which makes missiles a useful weapon. The target will simply drift out of position before your shell arrives, even if it doesn't know it's been fired upon. This is compounded by the difficulties of light-speed limited sensors such as radar.
Hacking ships controls will be, in all likelyhood, a major killer.
I really don't see how. Ruling out actual sabotage, as in an infiltrator placed there to disable the ship, the only way to 'hack' a ship's controls would be to establish a connection with its computer system. This is easily preventable, as one could simply turn wireless input OFF during combat except for very specific frequencies, and on those frequencies one could accept only telemetry or voice/visual data from allied spacecraft. Even that could be shut down should it become apparent that an attack is being attempted through them.
With wireless input off your only other option is a physical connection. If you can get inside the ship to connect to the computer, you may as well plant a bomb.
Also light sabers are impossible, but you can mail super heated plasma and give em' a good scorching like that.
Traveling a superhigh speeds will be a problem, seeing as the speed of light is impossible and warpholes are way too small.
I'm not even sure what to make of these two sentences. They make no sense at all. What is a warphole?