The White House Death Star petition was a joke, but the prospect of war in outer space is anything but.
"The wars of the future will not be fought on the battlefield or at sea," a military academy commandant voiced by Willem Dafoe intones toward the end of a now-classic 1997 episode of The Simpsons. "They will be fought in space, or possibly on top of a very tall mountain." This was meant as a joke, but the latter half of that statement would soon prove eerily prescient when India and Pakistan battled over Kashmir's Siachen glacier -- a strategically irrelevant ice field sitting over 18,000 feet above sea level -- during the Kargil War in 1999. For now, the prospect of military conflict in outer space still resides in the realm of dystopia or absurdity, to the point that a White House petition demanding the construction of a Star Wars-style "Death Star" could be treated as a harmless prank. In rejecting the petition this week, the White House rightly wondered why a debt-strapped U.S. government would spend $850 quadrillion on a weapons system "with a fundamental flaw that can be exploited by a one-man starship." Thankfully, the prospect of an orbital space-to-earth battlestation doesn't even need to be treated seriously.
But it wasn't always this way. In 1952, the eminent rocket scientist Werner Von Braun imagined that a future space station would function as an orbital nuclear platform. Space historians believe that Russia's Salyut 3 space station, which was launched in June of 1974, had a cannon on board, in case a craft or satellite from an enemy country attempted to disrupt its mission. The Soviet Union experimented with Fractional Orbital Bombardment Systems in the 1960s and 70s -- basically nuclear delivery systems that were capable of orbiting the earth. The U.S. even detonated a nuclear weapon over 200 miles above the Pacific Ocean in July of 1962, an incident known as Starfish Prime that, according to Harvard University astrophysicist Jonathan McDowell, halved the useful lifetime of all satellites then in orbit, knocked out power in Hawaii, created an artificial Van Allen Belt that persisted for five years, and released radiation into the atmosphere that wouldn't fully dissipate until the end of the decade. For a time, it was all but taken for granted that space would not only be militarized, but weaponized -- used as a venue or staging area for violent clashes between space-faring nations, or attacks on the surface of the earth. Space war wasn't a punch line, but a possibility that nuclear-armed powers didn't think they could afford to ignore.
The results of the Starfish event hint at one reason why that changed. "This is a great weapon. It does a lot of damage -- but it also killed everything you had yourself," McDowell says of the results of the high-altitude nuclear test. War in space was sure to have a cataclysmic effect on the country with the most space assets, regardless of the end result.
But what about war from space? For powerful space-faring countries, space-to-earth or earth-to-space combat is about as practical as it is desirable -- which is to say, not very. "Space is incredibly useful for the military for a lot of things," McDowell explains. "It's great for intelligence, communication and navigation. The natural thing is to ask, 'where are my X-Wing fighters?' The fact is that it's hard to find a rationale for them."
Laura Grego, a senior scientist in the global security program at the Union of Concerned Scientists, explained why an orbital weapons platform -- the kind of big-ticket military asset that you might want a fleet of X-Wing-type vehicles to protect -- is impractical for attacking targets on earth. "Everything in space is moving at rapid speeds. At the same time, the earth is rotating underneath it....as it's going around, you can't hold [the weapon] above your target. You might be over one country for 15 minutes and then you're gone." This tiny orbital window is called the absentee ratio, and an ICBM, which can hit any target on earth within minutes, isn't constrained by one. McDowell added that in order to reach atmospheric velocity, a rocket needs to reach a breakneck seven kilometers-per-second, far faster than the four to five kilometers-per-second an ICBM must travel. From a purely strategic standpoint, orbiting a weapon for space-to-ground use is more expensive and far less useful than existing, more earth-bound capabilities.
Simply orbiting a nuke, while possible, is good for little other than blackmail, or, at best, a Dr. Strangelove or Dead Hand-style insurance policy for a paranoid and heavily-armed space-faring state. The space nuke would be a means of ensuring that someone (or some thing) has the capability of effectively wiping out most or perhaps all of the 1,016 satellites that currently orbit the earth, while rendering their orbits so debris-strewn as to be totally and perhaps permanently useless. Such dangerous and cavalier behavior is the stuff of cinematic super-villainy -- not statecraft.
But there's another, more idealistic reason humanity is safe from the scourge of space war. And ironically, it suggests that we might not be safe forever.
The ban on Death Star-like orbital weaponry is one of the more robust norms in international law. A prohibition on stationing weapons of mass destruction in space, as well as the total demilitarization of the Moon, is enshrined in article 4 of the Outer Space Treaty of 1967, which 126 countries have signed. As University of Nebraska law professor and space law expert Frans von der Dunk notes, the treaty bans the stationing of weapons of mass destruction in space without banning their actual use in space. The stationing and use of kinetic or conventional weaponry is also allowed. Yet the most worrying aspect of the current legal regime is that the laws of war extend to the heavens as well. "The general international law on the law of force and the prohibition on the use of military force also applies in outer space," says von der Dunk. "If, as part of your self-defense you need your satellite to shoot down the satellite of your aggressor...that is perfectly allowed."
Even so, the 1967 treaty demonstrates that in space, the peaceniks seem to be winning, at least for now. Joan Johnson-Freese of the Naval War College explained that there are two ways that, at the most schematic level, there are two ways the international legal regime could conceive of outer space: "On one end you put the view that space is a common heritage of mankind," she says. "The other end of the spectrum is that air, land and sea are all environments, and all those environments have been weaponized and therefore it's inevitable that space too will also become weaponized." The latter formulation raises a number of chilling possibilities: most people probably don't expect a war to break out in space, but the soldiers at Siachen probably didn't expect to be fighting atop an 18,000 mountain pass either. Humanity has proven willing to fight over literally anything, so long as the capability exists. Why should we assume space will be different?
Space hasn't been weaponized, and the general anti-weaponization tilt of the 1967 treaty is part of the reason why. That tilt has gained the status of a respected legal norm, one arguably strengthened by the fact that the treaty itself was founded on a bedrock of mutual self-interest. "In the 1960s, the superpowers were able to agree that there was more of a benefit in keeping the other party from doing it than they saw a drawback in themselves being forced to abstain from it," von der Dunk says of the U.S. and Soviet Union's view towards stationing weapons of mass destruction in space. In other words, each side believed that preventing their opponent from weaponizing space was worth the potential strategic cost of foreclosing on their own ability to weaponize space. Even after the Cold War, the norm has endured.
Yet it's becoming increasingly clear that the existing international legal framework is ill-equipped in dealing with the most immediate, realistic -- and, therefore, worrying -- possibility of space combat. It's currently illegal to nuke the surface of the earth from outer space. But what can multilateral diplomacy and the international legal system do to prevent a future where countries shoot down each others' satellites, or ram their satellites into one another?
"As soon as you tweak a satellite to allow it to bump into another satellite -- which is easy to do -- almost immediately it would enter into the realm of weapons," says von der Drunk. And defensive war in space is absolutely legal -- if two space-faring countries were ever at war, one would have a legally valid justification for taking out the intelligence or communications satellites of its enemy. The vast majority of satellites have some kind of dual military and civilian use. Space has already become militarized. Does that mean that it's inevitable that space will also turn into a battlefield?
The Obama administration isn't building a Death Star, but it also isn't treating this question as the crucial, perhaps civilizational issue that it is.
In 2007, China successfully tested an earth-to-space anti-satellite weapon against an aging orbital weather station. The results of that weapons test, and of an accidental collision between satellites in 2009, now account for most of the hazardous debris in low earth orbit, according to Harvard's Jonathan McDowell.
Debris is worrying enough at low orbits, where the intentional destruction of an enemy satellite could wreak havoc on existing global communications and navigation systems. Luckily, there are plenty of usable orbits around the earth. There is, however, a single narrow five-to-ten mile band, roughly 23,000 miles above the earth's surface, where satellites can orbit in lockstep with a fixed point on earth, completing a single revolution around the earth once every 24 hours (rather than once every hour and a half, the speed at which the International Space Station orbits). This thin ribbon is the only point where a satellite can achieve what is known as "geostationary orbit" -- where it can function as a "tower 23,000 miles high," as McDowell puts it. Satellite dishes never have to angle to pick up the signal of a satellite in geostationary orbit. The line of communication is always open -- it's why receivers for satellite television and radio don't have to constantly be adjusted.
The destruction of geostationary orbit would have worrying consequences for humankind. "Geostationary orbit is vulnerable because it's a very precise orbit and it's relatively crowded," McDowell says. There's always the possibility that a satellite's fuel ignites, or that there's some other mishap in space. "If you add to that the danger of deliberate action then [geostationary orbit] is a resource that we could easily lose if a large explosion were to occur." And once it's gone, it's gone until humankind can invent some kind of orbital garbage-truck.
The surest way of foreclosing on the possibility of this all-too-plausible doomsday in space is through the same kind of multilateral efforts that have stanched the spread of nuclear arms, stigmatized the use of chemical weapons, and all but stricken catastrophic inter-state warfare from the face of the earth. The world needs a system of multilateral checks and balances that relegates war against space assets to the same political and psychic space as World War III: something that humanity, by dint of mutual self-interest and robust international institutions, has successfully turned into a geopolitical boogeyman, a bandied-about but nevertheless distant worst-case scenario.
That work has already begun. There is an international effort underway to create a "rules of the road for space" -- an update to the Outer Space Treaty that would establish guidelines for conduct in space. Secretary of State Hillary Clinton endorsed the process, if not every aspect of the still-to-be determined treaty, in a January, 2012 press release. The new treaty would be what international legal experts refer to as a "soft law:" a measure that would enshrine a set of shared principles and that might eventually gain the status of "hard" customary law, given enough time and enough precedent within the international system. For instance, the U.N. Security Council could sanction a country that violates the "rules of the road." But until such sanctions are passed, the treaty would exist without any solid coercive force -- it would be a declaration, rather than a piece of law; unspecific, and largely toothless.
Luckily, the rules of the road aren't the only space war treaty under discussion. Both China and Russia have expressed their support for a proposed Prevention of an Arms Race in Outer Space treaty, a multilateral agreement that would be more like the 1996 Comprehensive Nuclear Test Ban treaty -- a document that places very specific restrictions on the actions of its signatories. Right now, the biggest obstacle to the treaty's passage is the United States.
The U.S., which has obstructed or simply ignored the PAROS process, is concerned that the treaty could work against its interests. Russia and China might view the accord as a means of reigning in the U.S.'s future capabilities; the U.S., meanwhile, doesn't want to give its potential rivals a veto over the development of those capabilities. As von der Dunk puts it, the U.S. doesn't want to enter into "a treaty which would hurt the most powerful nation the most."
This is a legitimate concern, especially if the U.S. observes the PAROS treaty while other, less scrupulous actors attempt to undermine it. By preventing the U.S. from developing space weaponry, PAROS could theoretically shield future actors that are actually the most dead-set on weaponizing space. Johnson-Freese of the Naval War College, who is broadly supportive of a PAROS-like treaty, says that arms control issues in space are a "series of Catch-22s. It becomes difficult if not impossible to get over definitional hurdles and verification hurdles, or it can be made to seem that way by people who don't want to get things done."
But these are problems that lie at the heart of nearly every multilateral arms treaty. The U.S. has signed quite a few of those over the years. As the country with the most assets in space, the U.S. also has the most to lose from a future space conflict.
The Obama administration should use the Death Star petition -- a rare and all-too-fleeting excuse to focus on space war -- to begin to engage in the PAROS process in earnest. Officials should use this week's Death Star mania to publicly voice their issues with a treaty that could harm U.S. national security interests -- while also affirming the importance of an outer space arms control accord, and explaining its benefits for both the U.S. and humanity at large.
In the Star Wars universe, space is a place of danger, a domain where the powerful subjugate the weak, where Executors and TIE Fighters and Death Stars impose fascistic order, and where planetcide is an official state policy. Popular culture offers fewer more vivid examples of the potential costs of treating space like a battlefield or a frontier, rather than a shared resource or a common heritage. A modified version of the PAROS treaty, or a treaty modeled after it, could stave off our own all-too-possible version of that dystopia. The Death Star petition was a high-profile practical joke. But it's also an ideal opportunity to talk about an issue that deserves to be taken very seriously.