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J-2X Powerpack Test Lights Up the Sky
 
A burst of flame from a J-2X Powerpack test-firing lights up the sky on Dec. 5, 2012 at NASA's Stennis Space Center in Mississippi.
A burst of flame from a J-2X Powerpack test-firing lights up the sky on Dec. 5, 2012 at NASA's Stennis Space Center in Mississippi.