1.   A planned robotic landing mission was canceled because it depended on systems almost identical to those of the failed polar lander.

2.   If the mysterious blip turns out to be from the polar lander, it means the spacecraft probably failed in at least two ways.

3.   Indeed, with each passing hour, little hope remained that flight controllers would somehow establish radio contact with the missing polar lander.

4.   Its robot arm was almost identical to the one on the ill-starred polar lander.

5.   Most officials seem wary of over-optimism and assume that the polar lander will produce no sudden outburst.

6.   Mirror sites of the polar lander Internet site have been set up for the expected flood of visitors.

7.   Polar lander engineers say they elected to dispense with such a transmitter because they could not have responded even had they received a hint of a problem.

8.   That spacecraft is almost identical to the polar lander and so may have to be modified to correct any shortcomings revealed in the investigation.

9.   The polar lander is another risky mission.

10.   The polar lander will track the movement of water vapor and dust across Mars.