Here’s a look at how high-altitude balloons work, what they’re commonly used for, and how they compare with the unidentified objects in all the latest headlines.

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Here's a look at how high-altitude balloons work, what they're commonly used for, and how they compare with the unidentified objects in all the latest headlines.

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Here’s a look at how high-altitude balloons work, what they’re commonly used for, and how they compare with the unidentified objects in all the latest headlines.

Here's what high-altitude balloons are used for. A string of "unidentified objects" entered North American skies in the past few days, only to be shot down by US military aircraft.

CNN By Jackie Wattles, CNN A string of "unidentified objects" entered North American skies in the past few days, only to be shot down by US military ...