Scientists monitor information coming back from the Galileo spacecraft Wednesday, Dec. 6, 1995, while a picture of the spacecraft is shown on an overhead screen inside mission control center at the Space Flight Operations Facility at NASA's Jet Propulsion Laboratory in Pasadena, Calif. On Thursday, Galileo's 746-pound probe will enter Jupiter's atmosphere and start transmitting data. (AP Photo/Kevork Djansezian)