1.   Because of the double motion of orbiting spacecraft and the rotation of the Earth, images transmitted by Landsat satellites were subject to distortion.

2.   Blasts of killer electrons in the near-Earth environment also could damage the delicate control systems aboard orbiting spacecraft.

3.   Images transmitted to Earth last June by Mars Global Surveyor, the orbiting spacecraft, showed the planet to have dramatic features.

4.   In the nearer term, hydrogen would be used in fuel cells for cars, trucks and industrial plants, just as it already provides power for orbiting spacecraft.

5.   It is visible to the naked eye from orbiting spacecraft.

6.   Many orbiting spacecraft are visible just after dusk or before dawn, when they are high enough to reflect sunlight even as observers below are in darkness.

7.   New readings from orbiting spacecraft create a much different picture, in which dramatic shifts seem as commonplace as thunderstorms in the Mississippi Valley.

8.   Radar maps made by orbiting U.S. spacecraft show a barren, rocky landscape, scarred by volcanoes and impact craters.

9.   The Galileo probe will sample the gases through which it descends, making swift chemical analyses and sending the results back to the orbiting spacecraft.

10.   The hunt involves an Air Force telescope usually used for the surveillance of orbiting spacecraft, including foreign spy satellites.