Mars' 'Block Island'
This image provided by NASA of the rock informally named by scientists "Block Island" was taken on July 28, 2009, with the navigation camera on NASA’s Mars Exploration Rover Opportunity. Composition measurements by NASA's Mars Exploration Rover Opportunity confirmed Thursday Aug. 6, 2009 that this rock on the Martian surface is an iron-nickel meteorite. With a width of about two-thirds of a meter (2 feet), it is the largest meteorite yet found on Mars. Opportunity found a smaller iron-nickel meteorite, called "Heat Shield Rock" in late 2004.
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