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Sky-High costs: The A-3 tower at Stennis Space Center is designed to test how rocket engines operate at altitudes of up to 100,000 feet. Although NASA is compelled to complete the $350 million project, the tower will be mothballed. (NASA)

Sky-High costs: The A-3 tower at Stennis Space Center is designed to test how rocket engines operate at altitudes of up to 100,000 feet. Although NASA is compelled to complete the $350 million project, the tower will be mothballed. (NASA)

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