Jan 5, 2009 | 2
When NASA's Spirit and Opportunity rovers touched down on Mars, they were each tapped for three-month missions exploring the Red Planet. But five years later, both are still moving, providing a bright spot at a tumultuous time for the space agency.
Last Saturday marked the five-year anniversary of Spirit's landing on Mars, the start of an astonishingly long run by the rovers. (Opportunity landed safely three weeks later.) "The American taxpayer was told three months for each rover was the prime mission plan," Ed Weiler, associate administrator for NASA's Science Mission Directorate, said in a statement. "The twins have worked almost 20 times that long. That's an extraordinary return of investment in these challenging budgetary times."
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The Dow Chemical Company is the leading producer of polyalkylene glycols (PAGs) used in synthetic fluids and lubricants where petroleum,
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