11.  A Russian space rocket recently went up bearing the new logo for Pizza Hut.

12.  A U.S. news service summary of the account did not directly attribute the remarks to the cosmonauts or any Russian space official.

13.  Against this gloomy background, Mir is one of the glittering successes of the Russian space program.

14.  Burrough writes brilliantly about the National Aeronautics and Space Administration and the Russian space program, but his story transcends the details of the subject at hand.

15.  But failure to restore the flow of oxygen could force the evacuation of the space station and deal a major blow to the impoverished Russian space program.

16.  But for all the self-congratulation Saturday, Russian space officials acknowledged that the most difficult part of the repair mission lay ahead.

17.  But given the record thus far, NASA and the Russian space agency are right to keep Mir and its crew up there for the time being.

18.  But last month the Russian space agency announced that it might ditch the deteriorating space station in the Pacific in February unless it came come up with new investors.

19.  But Logsdon acknowledges that any pullback of American support may be a bitter pill for the Russian space officials.

20.  But James Oberg, a Houston-based aerospace engineer and author who has written extensively on the Russian space program, questions the wisdom of the repair mission.