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Space shuttle launch delayed again
21 February 2009 04:21pm
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NASA has delayed the launch of space shuttle Discovery for a fourth time amid valve concerns.
After meetings on Friday at Kennedy Space Centre in Florida, shuttle managers decided against launching in a week.
The launch had been targeted for no sooner than February 27; it was not immediately known when it might be rescheduled.
NASA originally hoped to send Discovery to the international space station on February 12th.
However extra tests were ordered for the valves that control the flow of hydrogen gas into the external fuel tank during liftoff.
One of those valves broke during the last shuttle launch in November.
Managers want to make sure if that happens again, the ship and its seven-man crew will be safe.
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