1.   Any general conclusions about the jumble of rocks on the Martian plain will have to await further chemical tests on other rocks, Golombek said.

2.   Surface erosion shows water probably flowed on the Martian plains in the past.

3.   The spacecraft is headed for a broad sandy Martian plain thought to have been once deluged under a great flood.

4.   The Vikings are silent relics on Martian plains.

5.   Named after black abolitionist Sojourner Truth, the six-wheel vehicle will move across the martian plain for at least a week.