1.   But engineers concluded that even a complete failure of the non-critical, rubber O-ring would not endanger the lives of shuttle astronauts.

2.   American shuttle astronauts successfully joined a second component in December.

3.   American shuttle astronauts use the same system.

4.   And spiderlike robots soon will be helping shuttle astronauts with their daily chores, such as toting heavy payloads and shooting photographs in orbit.

5.   Anticipating additional gyroscope losses, NASA in March announced an unscheduled servicing call by shuttle astronauts, weeks after a third Hubble gyroscope faltered.

6.   At Space-hab, he helped develop the pressurized modules used by shuttle astronauts to conduct experiments.

7.   A few were fortunate enough Thursday to receive responses from the shuttle astronauts themselves.

8.   But it provides scant information because shuttle astronauts are often just beginning to adapt to weightlessness by the time they come speeding back home.

9.   But the Hubble telescope was designed to be serviced by shuttle astronauts, with critical components housed in modules that can be readily removed and replaced with new equipment.