A Chinese spy balloon sighted in the skies of USA

What it means is intriguing the USA officials

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In the world of satellites and other advance surveillance system why spy balloon

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Spy Balloons was used heavily by USA during pre cold war era to keep an eye over its adversaries

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One reason given by experts is that there is something spy balloons can do which satellites can't

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One thing is that spy balloons can better reflect data about a particular location

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Balloons payload are less and cheaper to launch compared to satellites

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Spy balloons speed is less so they are not always easier to spot

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Space based systems are predictable but balloons are not

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A satellite can’t loiter and need in large number to get detailed idea of a place which a spy balloon can do effectively

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It might be spying system of high frequency, USA communication data, cell phone traffic among others

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