Gravity Probe BRocket launchby USALaunch time20 Apr 200416:57 UTCsuccessSerial number: Delta 304Science satellite.MissionRocketPayloadsRocket DeltaII 7920-10Claunched from Vandenberg AFB, SLC-2WUSAPayloadsTotal mass 3100 kgNamePurposeMassCommentGravity Probe B---