Another, Mars Global Surveyor, is on its way to orbit the planet in September and conduct a two-year mapping reconnaissance.

Recalling our previous night's map reconnaissance, I was about to say I thought we had another couple hundred meters to go when Wester whispered, "Shhhh!

A second low-cost craft, Mars Global Surveyor, is on its way to orbit Mars in September for a two-year mapping reconnaissance, which had been Mars Observer's primary objective.