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Aug 3, 2009 | 3
The indefatigable Opportunity rover, still motoring across the Red Planet five years into its mission, recently came across what may be a large meteorite sitting on the Martian surface.
The 0.6-meter rock, dubbed Block Island [detail below], would not be the first meteorite discovered on Mars by the rover, but would be notable for its size. Block Island is nearly twice as long as the meteorite known colloquially as Heat Shield Rock and formally designated Meridiani Planum, which Opportunity spotted in 2005. That meteorite was the first to be found on another planet and remains the only one formally accepted by the Meteoritical Society. (Meridiani Planum was found on a plain of the same name; the Meteoritical Society's convention is to name meteorites for a nearby geographic feature.)
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