Spherules found at Meridiani Planum are composed largely of hematite mineral - another piece of the puzzle that points to a watery past at this location. The image above is a false-color composite of three images captured by the Panoramic Camera through infrared, green, and violet filters. CREDIT: NASA/JPL/Cornell. Click to enlarge.
Among the signs of water at Opportunity's location are the round, BB-sized particles like these seen in a mosaic from the microscopic image taken at the rock outcrop dubbed 'Guadalupe.' These spherules are not concentrated at particular layers within the rock, as they would likely be if they originated outside the rock and were deposited onto accumulating layers while the rock was forming. Image Credit: NASA/JPL/US Geological Survey
A new 3-D image of the mysterious spheres or spherules happened upon by the Mars Rover Opportunity. Credit: NASA/JPL
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