(12/19/1999) -The blazing light of Space Shuttle Discovery's launch turns night into day at Launch Pad 39B as billows of smoke and steam rise behind it. The successful liftoff occurred on time at 7:50:00.069 EST from Launch Pad 39B on mission STS-103. On board are Commander Curtis L. Brown Jr., Pilot Scott J. Kelly and Mission Specialists Steven L. Smith, C. Michael Foale (Ph.D.), John M. Grunsfeld (Ph.D.), Claude Nicollier of Switzerland and Jean-François Clervoy of France. Nicollier and Clervoy are with the European Space Agency. STS-103 is a Hubble Servicing Mission, with three planned space walks designed to install new equipment and replace old. The primary objective is to replace the gyroscopes that make up the three Rate Sensor Units. Extravehicular activities include installing a new computer, changing out one of the Fine Guidance Sensors, replacing a tape recorder with a new solid state recorder, and installing a voltage/temperature improvement kit, and begin repairing the insulation on the telescope's outer surface. After the 7-day, 21-hour mission, Discovery is expected to land at KSC Monday, Dec. 27, at about 5:24 p.m. EST. This is the 27th flight of Discovery and the 96th mission in the Space Shuttle Program. It is the third launch at Kennedy Space Center in 1999