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PHOENIX (AP) - What was later identified as a NASA research balloon had some Arizonans wondering whether they had spotted an alien spacecraft. Federal Aviation Administration spokesman Ian Gregor says he got calls about the object all afternoon yesterday. He said the object did not show up on FAA radar and was likely a balloon. Later, Bill Stepp of the Columbia Scientific Balloon Facility in Palestine, Texas identified the object as a 4,000-pound research balloon released from a NASA organization used to measure gamma ray emissions in high altitudes.