The launch of the Discovery space shuttle has been postponed for a week to perform additional security checks. NASA said they delayed the launch to May 22 because of paperwork delays and because they need more time to study unresolved safety issues.
Discovery will be the launch of the first space shuttle since the terrible Columbia space shuttle accident in February 2003.
Bill Parsons,, program manager, says that the May 15 date had always been open for re-evaluation. He further added that the new launch date allows more breathing room and some time to ensure they do things with the same rigour they've had all along the way.