11.   For instance, the lander spacecraft is to probe deep beneath the Martian surface in search of water, which is considered the crucial ingredient for life.

12.   If the spacecraft is in good shape, Odyssey will begin to gradually alter its orbit within three days through a process called aerobraking.

13.   In scale alone, this spacecraft is something of a relic, a reminder of a more politically solvent NASA.

14.   It completely changed the way the spacecraft is to process its scientific data and photographs, primarily through a method of data compression.

15.   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.

16.   Mission managers planned several hours of analysis to confirm the spacecraft had maneuvered into the desired looping orbit around Mars and the spacecraft was in good health.

17.   Not only do they have the same number of satellites, but the spacecraft are in similar orbits.

18.   On each of its closest approaches to the planet, the spacecraft is to dip briefly into the atmosphere.

19.   Scheduled for launching next September, the spacecraft is to go into an orbit of the Moon that repeatedly crosses both poles.

20.   So, the Progress spacecraft will be used to stabilize Mir in space and possibly boost it to a higher orbit.