The mars expeiment

摘要

On August 5, NASA's Mars Sci-ence Laboratory wilt reach the outer edge of the Martian at-mosphere. The 8,500-pound craft will have traveled 352 million miles at speeds of up to 13,200 mph, but its real work will have only just begun. Over the next seven minutes It will plummet through 80 miles of atmosphere, withstanding temperatures of up to 3,800°F, and guide itself to a sudden halt in the massive Gale Crater. The MSL is the most ambitious Mars project to date. Its rover, named Curiosity, is twice as long and five times as heavy as its predecessors, Spirit and Opportunity. Its 150-square-mile landing zone Is a third of the size of that of previous missions, requiring unprecedented accuracy.