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6 March 2014 1:04 pm ,
Vol. 343 ,
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Rover Takes a Deep Look Into Mars
10 August 2011 2:15 pm
Yesterday, after a 3-year, 21-kilometer journey at top speeds of less than 0.2 kilometer per hour, the Opportunity rover finally arrived at Mars's Endeavour crater. The intrepid explorer had already poked into 11 craters, the largest 750-meter-wide, 70-meter-deep Victoria, and analyzed rocks and soil along 33 kilometers of track. But the geologic story it read there always spoke of an ancient martian wasteland of windblown dunes pocked by the occasional acid-laced puddle. Now that it has arrived at 22-kilometer-wide, 300-meter-deep Endeavour, Opportunity may be on the brink of rock from earlier, more hospitable times in martian history. NASA's Mars Reconnaissance Orbiter has detected clay in rock of the crater rim exposed by the far larger impact explosion that created Endeavour. And the presence of clay tells geologists that water altered the rock under far milder, presumably more habitable conditions than those that produced the rock Opportunity or any other rover has analyzed to date. NASA's $2.5 billion Curiosity rover scheduled to launch this November, if successful, will not likely reach its clay-bearing target in Gale crater until 2013.
See more ScienceShots.