The problems of orbital strike constellations
by Laura Grego and David Wright
|In reality, space is already used for those tasks it is best suited to, and not those it isn’t. Basic physics dictates this.|
Moreover, the intuitive appeal that bombing from space has for many people—that weapons can be “dropped” from above a target—is simply wrong. Objects in orbit stay in orbit unless there is a force to push them back toward the ground. Not only do orbiting ground-attack weapons require a large rocket to get them into space in the first place, they must carry large amounts of fuel (essentially another rocket) to accelerate them back out of their orbit and down to earth. Since launching mass into orbit costs roughly $10,000 per pound, such a constellation becomes very expensive. Moreover, since the weapons and their rockets are orbiting in space for years, reliability becomes a concern.
In reality, space is already used for those tasks it is best suited to, and not those it isn’t. Basic physics dictates this. The long distances and high orbital velocities characteristic of satellites make space-basing a poor choice for missions which require transferring mass back and forth to Earth, especially if it needs to be done rapidly. When it is electromagnetic signals that need to be transferred back and forth—such as for communication, navigation, and observation missions—space-basing is a natural choice.
Mr. Stone pairs his call for space-based global strike weapons with the idea that the United States’ enormous investment in space needs to be protected. While this concern is legitimate, such global strike weapons have at most a superficial relationship to satellite safeguarding. Space-based weapons can do very little to protect satellite systems from being attacked. Satellites systems are visible and easily tracked from the ground, and are vulnerable to many kinds of attack, few of them addressable with space-based weapons. Nations will not be able to reliably protect individual satellites from interference by a determined adversary. As we discuss in our report, the best solution to the issue of satellite system vulnerability is to make satellites less attractive targets and to protect the functioning of the systems they are part of by hardening the satellite systems, distributing the tasks of large satellites to suites of smaller ones, developing the capability to rapidly replace lost satellites, and providing air- and ground-based backup systems for critical capabilities. In addition, the United States should be doing everything it can to strengthen the current taboo against the testing and deployment of destructive anti-satellite weapons by all countries.
Although there may be a desire for space-based ground-attack weapons, there is very little to recommend it.