US officials said on Thursday that the spy balloon was floating above commercial air traffic at roughly 60,000 feet and that it does not pose a threat to people or activity on the ground.
Spy balloons are a historic technology and were widely utilized before the development of low-Earth and geosynchronous satellites, including extensive use in the 1950s by the US during the Cold War. But these days, their use has largely fallen out of favor. Spy balloons have some advantages over satellites. They are cheap to deploy, fly relatively close to their targets, and can continuously monitor a location for longer stints.
“You may have noticed that this balloon has caused a massive international incident, and it’s got everyone looking at China and demanding that the US government do something. In terms of surveillance, this is the kind of attention you don't want,” says Brynn Tannehill, a RAND Corporation senior technical analyst and a former naval aviator. “My assessment is that the advantages a balloon offers versus the amount of unwanted attention it creates—I can't answer why the Chinese did this.
Sensor-equipped balloons have onboard steering capabilities but are transported by wind currents. The senior DOD official noted that the balloon is big enough to cause a potentially dangerous debris field if the US shot down the balloon over an inhabited area. The official added that the military considered taking kinetic action on Wednesday while the balloon was moving over “sparsely populated areas in Montana,” but concluded that the risks weren't low enough.
Brigadier General Pat Ryder, the Pentagon press secretary, said on Thursday that, "instances of this kind of balloon activity have been observed previously over the past several years. Once the balloon was detected, the US government acted immediately to protect against the collection of sensitive information.
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