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Tales In The Tracks
Even before Spirit set "foot" on martian soil, she was returning stunning images of her new surroundings. And, with her first triumphant roll off the lander, she set out to accomplish lofty science goals. What she left in her wake makes for great bonus science too. Both Spirit and Opportunity are equipped with a sophisticated suite of scientific instruments, but you wouldn't think the wheels were among them - or would you? As the wheels move across the martian surface as they are designed to do, they churn up clues that help scientists. "I would compare the rover tracks to the boot prints of geologists walking around on Earth," said Dr. Lutz Richter, of the German Space Agency and Mars Exploration Rover science team member. "They immediately give us information about the nature of the material on which we are roving."
How far have we sunk? "The material we are on has given way to the weight of the rover in some places," Richter noted. "We can measure the amount of sinkage and that tells us the strength of the material that we are on. It is a 'cheap' measure of information for us that we can use throughout the mission. So far we have seen a lot of variation." Lacking any kind of interplanetary ruler, scientists rely on advanced software, developed at NASA's Jet Propulsion Laboratory, called the Science Activity Planner, to make measurements. Using stereo images from the rover cameras and the known weight of the rover and its wheels, scientists can get very accurate information about the surface material.
What are we looking at? From previous missions to the surface of Mars we've seen similar materials but not such a large area of it, Richter said. Preliminary chemical analyses indicate high amounts of chlorine and sulfur.
Water's role "For climate studies this understanding is very important because there must have been some moisture at work - even if only in low quantities," he said. "There's a water cycle on Mars. There are certain times of year that trace amounts of water are present in certain locations. There is also water vapor in the atmosphere and ice below the surface. Perhaps a few hundred thousand years ago the atmosphere might have been saturated and could have been responsible for this recent crust at the Gusev site."
Seeing Eons Below the Surface "Below the crust would be any evidence of the lake deposits - perhaps a few meters - but we don't know because there may have been volcanic activity there," Richter explained. "That's why it's so important to go to the nearby crater because there are ejecta rocks there that would give us a clue about what lies far beneath the crust. Ejecta rocks are those that were sent flying when an impact created the crater hole." Rover wheels aren't just for driving anymore! Proof that driving on Mars is anything but "routine," they reveal a part of Mars that time has covered up. Related Links Mars Rovers at JPL Mars Rovers at Cornell SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Into the Briny Deep - Perhaps Moffett Field - Feb 25, 2004 Opportunity has been getting the lion's share of the attention in recent weeks, because its twin sister Spirit has been engaged mostly in long-distance driving. But it may be about to steal the spotlight. For several sols, Spirit has been working its way towards nearby Bonneville crater. But even before it gets there, the mobile robot may make a critical discovery. It may find evidence of liquid water on Mars.
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