World News | Associated Press | Friday April 29, 2011
NASA has called off Friday's launch of space shuttle Endeavour because of a heater failure.Commander Mark Kelly and his crew were on their way to the launch pad, when NASA halted the countdown. The astronauts' van did a U-turn, and returned the astronauts to crew quarters.NASA spokesman George Dillard says the next try will be Sunday at the earlies...
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