The US shot down four flying objects over fears of spy balloons. But what else are high altitude balloons used for?
. For the 17 years before March 2021, the agency catalogued 263 UAP reports; since that date, there have been 247 in less than 2 years. Out of 366 reports analysed, 163 were characterized as balloons, 26 as unmanned aircraft and 6 as clutter.Balloons are a valuable tool for getting a good view downwards or upwards, from an altitude higher than drones or planes can reach and at a lower cost than satellites.
Some scientists use much larger, longer-lasting balloons, for example to get a clear view of space, or to test instruments destined for high altitudes. NASA’s Wallops Flight Facility in Virginia manages the launch of about 10–15 scientific balloons each year worldwide. These can carry around 3,000 kg, expand to be larger than a football stadium, and fly to an altitude of 37 km.
Corporate uses of balloons include providing Wi-Fi in remote regions, while some amateur enthusiasts launch. These silver-coloured, plastic Mylar balloons typically measure less than 1 m in size and are harmless, says Krueger, carrying amateur radios and payloads of just a few grams. But these shiny balloons would “light up radar like nobody’s business”, says Krueger, and their typical flight altitude is around 12 km.
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