Combat is an ongoing project (hence why this game is technically in beta). Expect it to be several years before ships can fire at each other.
Jereen Tavqus Year 14 Day 320 13:11
Yes as Ebenezzer said space combat has not been implemented but this also applies for ground vehicles with weapons, so when your buying a ship you don't have to factor weapons in to the equation at the moment.
You have to admit it is really nice to be able to fly in to enemy territory "guarded" by heavily armed capital ships and space stations and just go right through without them being able to do anything about it. But on the revers side it is annoying to have ships from enemy factions cluttering up your star system.
Ka`rla Leakey Year 14 Day 320 11:02
Devs haven't decided to fit an 'ON' switch to them yet. Space combat will be one of the last things implemented after ground combat is sorted (Go to Derra to try it).
Ebenezzer Saxon Year 14 Day 320 10:57
How come when I try to shoot another ship in space my weapons do not fire.