11.   They shifted the satellite launchings back to unmanned rockets.

12.   After Challenger and the second TDRS satellite were destroyed by a leaking solid rocket booster, President Reagan ordered that unmanned rockets be used to carry up commercial satellites.

13.   All of the next-generation data-relay satellites will be lofted on unmanned rockets.

14.   It cites as examples unmanned balloons, moored balloons, kites or unmanned nonnuclear rockets or missiles.

15.   Just minutes before the satellite was released, an unmanned rocket carrying a Korean communications satellite blasted off from Cape Canaveral.

16.   Mikhail Tyurin and then Vladimir Dezhurov floated out of the Russian docking compartment that was brought up last month on an unmanned Russian rocket.

17.   NASA defended the use of a manned spacecraft to carry up a satellite that could have been put in orbit by an unmanned rocket.

18.   NASA defends its use of Discovery to carry up a satellite that could have been carried up by an unmanned rocket.

19.   On Wednesday, NASA plans to launch the Mars Global Surveyor on an unmanned rocket.

20.   Officials said the countdown for the unmanned rocket, set to blast off from its space base in South America, could be restarted at any moment.