1.   For these reasons, many engineers and mission planners have favored the use of nuclear power for the lunar base.

2.   .Even so, the risk poses a quandary for mission planners.

3.   After Dr. Lucid goes aboard Mir, mission planners said, the shuttle might undock after only a day and return immediately to Earth.

4.   Cerf, now with MCI-Worldcom, is working with Mars mission planners at the Jet Propulsion Laboratory in La Canada Flintridge.

5.   If there are no failures, he suggested, it probably means the mission planners are not being bold enough.

6.   Knowing how much cloud cover to expect could help mission planners figure out how to schedule its activities to make the best use of the available light.

7.   Knowing the conditions on the planet is important for mission planners of the two Mars spacecraft, which both rely on the Martian air to slow down.

8.   Next to him, functioning as mission planner and navigator, was Schweitzer.

9.   Regele, a Presbyterian minister and congregational mission planner, begs to differ.

10.   However, the difficulty of exploring such rugged terrain has stumped mission planners.