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LAUNCH STILL HOLDING

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NASA said Thursday it is unlikely the shuttle Discovery will be launched with the Hubble Space Telescope before the week of April 22.

Shuttle managers estimated after a meeting Wednesday the launch delay would last seven to 14 days. But the agency learned overnight that a malfunctioning shuttle power unit would have to be replaced entirely.A decision on the launch date was not expected until next week.

"There are too many unknowns to establish a target date," National Aeronautics and Space Administration spokesman Bruce Buckingham said.