feather240 said:
I've been wondering what space combat would be like. In space you're capable at moving at extreme speeds with almost no slow down from friction, so I can't help but wonder how we would fight in it. Here's some examples I've been going over.
Boarding: Get in and kill the crew. I can't imagine this working without some kind of combat spacesuit and even then it would be hard to stay on without magnets or some other kind of climbing rig. This isn't even mentioning the fact that a force-field could fry you, and that in 3D space you have another dimension to worry about when trying to get near an enemy ship.
Lasers: I don't think we have the technology for it, but lets pretend we do. Even if we could get it to work I don't know how it would react against a force-field, and collateral damage would be a major problem.
Missiles: Homing missiles and heat-seekers sound like a good idea, but they can't change speed to match the ships. If they go to fast they'll zoom right by, if they're too slow they can be outmaneuvered.
Kinetic Weapons: It sounds the cheapest to me, just get a ball of iron and put it in a magnetic cannon. You can tear through most ships with ease, but like the laser it has collateral damage problems, and it would require a computer to take care of ballistics, assuming you can guess where the ship's going next in the depth of space.
Ramming: I'd imagine this would be the easiest. Turn on shields to full and ram through a ships hull. You don't even need to ram them, just brush by them and they're gone.
Other: This one is a- ... -_-
You're a bit lacking in information...
1) Boarding would require actually getting to the target physically which would be ridiculously difficult, given that it's going to be hard to equip a human to survive point defence fire from a spaceship let alone main cannon fire whilst still allowing him to move in the relatively cramped interiors. Even getting close would be an absolute pain - stealth is a ***** in space as everything you do generates heat which takes a long time to radiate away and stands out like a sore thumb in the cold background radiation. And before you think that cold space = good cooling, bear in mind why vacuum flasks work: vacuum is a good insulator..
2) as people have already pointed out, we already have lasers, and the US has weaponised them. If they wanted to, they could start making an air fleet of C130s with lasers, and atm are researching boat-based laser point defences. The advantage of them in space is there's no atmosphere to attenuate the beam, allowing far greater ranges and accuracy than in atmosphere. Plus of course, they are the fastest weapon system we have.
3) Missiles are great as a kinetic weapon, less so as explosives. Whilst they still have fuel they can correct their flight path, unlike with ballistic rounds, and they'll cause a hell of a lot of damage on impact. Of course, their relative complexity compared to solid slugs means that point defence weapons are more effective against them, but if you're using kinetic warheads anyway (read: big heavy lumps of metal designed to rip the target a new one) they you're still in with a chance to cause damage.
3) Kinetic weapons are slow. The damage potential is huge, but you're going to have to get close to actually hit. I'll go into that more in a minute.
4) Ramming... erm, have you been watching too much Star Trek? What's this about disintegrating forcefields? Even if 'shields' were defined, would not the enemy have them too? And how close do you think these ships are?!
Most important point: DISTANCE. Star Wars and Star Trek, and the majority of other popular sci-fi might look all cool and flshy, with battleships grazing past each other spitting firey death into each other's shimmering deflector bubbles, but take a step back for a second and think.
You have lasers, which can be pin-point accurate at light-second distances. LIGHT SECOND - that's 299,792.458 kilometres. In one second. By comparison, a 1950's naval cannon might have a muzzle velocity of 808 meters/s - that's like 370,000 times faster. At one second time intervals your manoeuvring options are limited, so you'll want to be further away if you don't want crispifying by lasers. Then again, as Kelbear points out, lasers are HOT to use, so perhaps it's best not to.
Use magnetically accelerated slugs instead - current tech is looking to fire 1.1g slugs at 7000 m/s, and with no atmosphere to attenuate speed you're going to be hitting your target at full speed (and therefore energy). If you hit. That's the problem with kinetics: they are hit-and-miss. Sure, you're going to be turning their armour to plasma if you hit, but at any range they are going to be able to evade you easily in all three dimensions.
That brings us to missiles: fire them from your mag accelerators to extend their range, just as you would with the kinetic slugs, but then they use their onboard propulsion to stay on target. The increased accuracy this gives is offset by the increased complexity and expense of each round, and the missile's vulnerability to damage by point defences - hit the propulsion system and the missile's screwed. No need to use explosive warheads, just have them hit really hard. Even nukes wouldn't be that great as most of the thermal energy would be lost to space and radiation shielding would be standard on spaceships. Of course, get a nuke into the ship inside a kinetic missile and that would be a different story, but would be FAR to expensive to do on a mass scale.
[TL; DR]
So, kinetics rape at short range, missiles at longer range, point defences are necessary to protect against missiles, and if you've got some large celestial body to act as a heatsink then lasers would be a great static defence!