1034516-Joe-AcabaNASA delays the launch of the shut­tle for the fourth time on Fri­day, due to cracked valves the three valves are locat­ed in the shut­tle engine com­part­ment and route gaseous hydro­gen into the fuel tank to keep it pres­sur­ized prop­er­ly..  This will also delay the flight of the first Puer­to Rican Astro­naut.  NASA hopes to be able to launch the space shut­tle by mid- March.  If they are unable to launch by then the shut­tle will have to wait until April to Launch.