From the Washington Post:
According to the NORAD Tracks Santa Web site, radar gives NORAD the first indication that Santa has taken off from the North Pole. NORAD uses, in addition to Santa cams and a fighter jet escort, geosynchronous satellites equipped with infrared sensors that can zero in on — “Amazingly, Rudolph’s bright red nose gives off an infrared signature, which allows our satellites to detect Rudolph and Santa,” the site says.
Have yourself a merry little holiday!
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