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Iain Boyd, Professor of Aerospace Engineering Sciences, University of Colorado Boulder

Chinese spy balloon over the US: An aerospace expert explains how the balloons work and what they can see

A Chinese surveillance balloon in U.S. airspace before it was shot down by the U.S. military. Peter Zay/Anadolu Agency via Getty Images

The U.S. military shot down what U.S. officials called a Chinese surveillance balloon off the coast of South Carolina on Feb. 4, 2023. Officials said that the U.S. Navy planned to recover the debris, which is in shallow water.

The U.S. and Canada tracked the balloon as it crossed the Aleutian Islands, passed over Western Canada and entered U.S. airspace over Idaho. Officials of the U.S. Department of Defense confirmed on Feb. 2, 2023, that the military was tracking the balloon as it flew over the continental U.S. at an altitude of about 60,000 feet, including over Malmstrom Air Force Base in Montana. The base houses the 341st Missile Wing, which operates nuclear intercontinental ballistic missiles.

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