US confirms for first time it has deployed space weapons
bbc.com381 points by harporoeder 17 hours ago
381 points by harporoeder 17 hours ago
Space really should be a neutral ground like Antarctica. Especially since the consequences of space debris might trigger the Kessler effect [1], denying humanity future access to low-earth orbit for the considerable future.
There is the Outer Space Treaty (1967), which forbids placing "nuclear weapons or other weapons of mass destruction in orbit or on celestial bodies or station them in outer space in any other manner", but you can get around that by saying that it's just a conventional weapon, not nuclear or WMD. If it's for space to space combat, you could say that any weapon is potentially a WMD due to the Kessler potential, but if its space to ground, like an orbital missile platform or something, you are technically in the clear.
I'm guessing it doesn't ban weapons in space completely because of things like the survival guns on Soyuz (if they still fly them), used for defending yourself against wild animals in the event that you land in a forest or similar. "No weapons in space" would ban that as well, but I think it's reasonable to have a survival kit, just in case
Realistically pretty much anything in orbit is a viable space to space weapon (for related reasons all space propulsion is ITAR controlled) so it was never practical to ban them. Space to earth, maybe, but that isn't unless it hits vague 'WMD' categories, and I'm not sure space to ground is necessarily what the US is declaring here.
I suspect whatever capability the US is referring to is far more "counter space" than WMD in scope and an incremental improvement on kinetic and electronic warfare capabilities it's long had. You can do a lot of irresponsible damage in to space assets with ground launched anti-satellite capability, as multiple tests have already demonstrated...
A bullet travels at a relative speed of about 250 to 1250m/s. A ~10g projectile moving that fast has an energy of 600-16000 joules.
Everything in low Earth orbit is moving at 7600m/s. A ~10g projectile moving that fast has an energy of 580,000 joules. Getting hit by something moving that fast is roughly equivalent to getting hit by a whole ammo case of bullets at the same speed. There is no armor that can protect you; Even the most solid objects behave like fluids at this relative velocity, potentially incurring more damage from the explosion / shockwave splatter than a thinner object that would allow you to overpenetrate.
A cardboard box of ball bearings with a handgrenade in it in LEO being triggered could wipe out nearly everything up there, and depending on the exact altitude it could effectively mine LEO and prevent humanity from using it for a long time, with a selectable duration between months or millennia depending on altitude.
"Space warfare" in LEO is a matter of everybody walking around with a personal nuclear weapon strapped to their back that can be activated on a hair trigger. We may well wipe everything out by accident, if it gets too crowded or because somebody stubbed their toe. Regardless, there is no selectivity, and any actor with space launch capability can blot out our access at will in ways that will outlive them.
Basically our only hope of continued use is things that persuade us to refrain from attempting to incorporate space into a theatre of war. That box of ball bearings should have higher stakes on the escalation ladder than a tactical nuclear strike. And it probably shouldn't be there in the first place.
While armor is indeed much harder in space, it is not impossible:
https://en.wikipedia.org/wiki/Whipple_shield
Whipple shields use spaced plates to disperse the impact of a projectile on the first plate over a larger area on the second plate, and so on and so forth over four or five plates such that the final plate is not penetrated.
My father worked on high velocity impact ballistics and has some very nice multiple exposure results. The light gas guns used to propel the test cubes are just as interesting as the shields themselves.
Whipple Shields are a very important part of protecting things like the ISS, but are optimized more for chance high velocity impacts with tiny bits of debris than an adversary's targeted projectile or their robotic arm grappler, or indeed non-kinetic weapons like directed energy or EMPs which is probably the capability the US intends to imply here.
You know nothing about space armor until you manage to shoot down Amarr's dreadnought in Eve Online, tyvm.
> Everything in low Earth orbit is moving at 7600m/s. A ~10g projectile moving that fast has an energy of 580,000 joules.
What matters is the relative velocity of the projectile towards the target. I practice it will be smaller or larger (if the bullet is incoming). But steering an incoming projectile is way harder.
What matters is the relative velocity of the projectile towards the target.
True. If you really want to mess space up forever you need to launch a rocket full of sand, slingshot around the moon, and gently sprinkle it in an retrograde orbit. That would be fast enough for something as small as a grain of sand to create pinhole-sized punctures in anything put in orbit, and after a few years the sand would be spread out enough to make any launch essentially impossible.
I might have thought about this too much.
Space is really, really big. I think it's hard for us to comprehend just how much space is in space, especially in 3-dimensional terms. It would take a lot of sand to mine all of the useful orbital space, and that's just LEO. There's tons of room in higher orbits. It would measurably increase the risk of passing through LEO on the way to other destinations and make some orbital planes unusable for e.g. Starlink or human habitation, but when you're just passing through, the odds of getting punctured are probably still reasonable, at least for unmanned spacecraft. Keep in mind that the ISS maneuvers out of the way when there are several miles to a potential impactor, just in case. We have all our eggs in one basket right now, so everybody is really careful with that one basket.
It would take a lot of sand to mine all of the useful orbital space, and that's just LEO.
Nope. You just need to make it a high enough probability of your spaceship being damaged that people won't take the risk. For humans that's very low. For anything moderately expensive it's quite low.
There's tons of room in higher orbits.
You have to go through the lower orbits to get there.
> You have to go through the lower orbits to get there
Math doesn't math.
The closest solution I've seen is putting 10^6 to 10^9 kg fragmented debris in the 700 to 1,000 km band to create a 5% failure rate at fastest transit, which is economically devastating. But that assumes away grain-grain collisions.
I think when I last ran the math, you'd need to sustain 5 to 10 Starship loads of fragmented debris to that orbit a week to create a proper barrier–near 100% hazard. At which point the solution becomes shooting down those launch vehicles. In a couple years (3 to 10, depending on the solar cycle), the skies would clear to about 1% hazard. That hazard, however, would persist for some time–how long is anybody's guess.
> But steering an incoming projectile is way harder.
It's usually much easier to steer an outgoing projectile. :P
It's not quite as bad as that. Space is big and hitting stuff is really hard. Your hand grenade scenario has effectively been done a few times and it (obviously) didn't make LEO unusable. For example: https://en.wikipedia.org/wiki/2009_satellite_collision
There are thousands of pieces of debris in LEO large enough to be tracked, and a lot more that's too small to track but big enough to do serious damage. This isn't good but it's not wiping everything out. Adding a few thousand more pieces of debris would not be even remotely as bad as using a tactical nuclear weapon in war would be.
> Adding a few thousand more pieces of debris would not be even remotely as bad as using a tactical nuclear weapon in war would be.
The worst effect would be a nuclear weapon in space. The resulting EMP would probably fry more than enough electric and electronic devices to throw back whatever country is hit by it by decades.
If someone launched a nuke in space how would other nuclear powers react? I doubt they would assume "this is probably just an EMP and not a direct nuclear strike on our territory"
> If someone launched a nuke in space how would other nuclear powers react?
We'd bitch and moan and then carry on as usual. Nobody is starting thermonuclear war over fried birds. Maybe someone gets tariffed.
If you had time to plan it, you'd probably want to put the warhead on a satellite launched by a normal satellite launcher. It'll look benign until you detonate it.
Plot twist - someone has already thought about this and took measures of unimaginable scale...so that, no one, ever, wipes out, humanity, with nukes.