41.   That power will make it possible for the shuttle astronauts to turn on a pair of computers mounted on the left and right sides of the American module.

42.   The certificates will be placed in envelopes emblazoned with a color scene of a spacewalking shuttle astronaut.

43.   The five shuttle astronauts plan to depart Mir this weekend and end their eight-day flight Monday.

44.   The first component of the anchoring device, a small electrically driven rail car, was installed by shuttle astronauts earlier this year.

45.   The flight is the first to the unstaffed outpost since shuttle astronauts joined the first two components, the Russian Zarya and American Unity modules, last December.

46.   The Hubble telescope, by contrast, was designed from the start to be serviced and have its various cameras replaced by shuttle astronauts.

47.   The installation of the beam will require four long spacewalks by the shuttle astronauts.

48.   The original plan called for shuttle astronauts to retrieve the Wake Shield on Wednesday.

49.   The robot arm work will require three long spacewalks by shuttle astronauts Franklin Chang-Diaz and Philippe Perrin.

50.   The Russians lack a sophisticated satellite communications network like that of the United States, which permits shuttle astronauts to maintain near-constant communication with ground controllers.