1.   Astronauts may lose a feel for the location of their limbs and find it difficult to guide their hands.

2.   Astronauts lose significant amounts of muscle and bone mass while they are weightless, a major impediment to a lengthy voyage to Mars.

3.   Columbia astronauts lost their Spartan solar observatory Friday when the spacecraft malfunctioned moments after its release and an effort to snag it nudged the satellite into a slow tumble.

4.   For reasons not yet understood, astronauts lose red blood cells, which may hamper their ability to do sustained work after a long period in space.

5.   NASA says the astronauts lose about an hour of sleep every night.

6.   Since astronauts lose bone mass under weightless conditions, they need more calcium and vitamin D than earthbound people.

7.   The socket tool got away from Ross and rose above the nose of Endeavour before the astronauts lost sight of it.

8.   Will an older astronaut lose as much bone as younger ones?

9.   Astronauts lost half a day of work because of time spent fixing the problems, flight director Paul Hill said earlier.

10.   Astronauts lost half a day of work because of time spent fixing the problems, Hill said.