1.   The Soviet Union, in preparation for manned landings, then concentrated on landing automatic unmanned spacecraft on the lunar surface.

2.   ...a special unmanned spacecraft.

3.   But continuation of the program also has risks -- chiefly that the costly manned missions might increasingly squeeze out highly productive scientific missions using unmanned spacecraft.

4.   China announced Sunday its first successful launching and recovery of an unmanned spacecraft, an important step toward its goal of putting humans in space.

5.   It lost both unmanned Mars spacecraft and all four shuttles were sent back to the rack after they were found to have frayed wiring.

6.   NASA now plans to send a pair of unmanned spacecraft to Mars every two years for the next decade.

7.   The ashes will reach the surface of the moon in about a year when the unmanned Lunar Prospector spacecraft runs out of fuel.

8.   The space program still draws thousands for launches of the space shuttle or one of the many smaller unmanned spacecraft.

9.   They were required reading for Martinez, a math and science whiz who envisioned a career as an engineer designing unmanned American spacecraft.

10.   This causes our natural satellite to keep shaking whenever a large meteor or unmanned spacecraft collides with it.