Penny for Your Reference
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ Jan. 16, 2004
This close-up image of a penny shows the degree to which the microscopic imager on the Mars Exploration Rover Spirit can zoom in on a target. The penny is seen exactly as it would be on Mars if it were placed under the microscopic imager. This picture was taken by the imager during testing at JPL.
Spirit's Microscopic Vision Demonstrated
This close-up image of a penny shows the power of the microscopic imager onboard the Mars Exploration Rover Spirit to see fine details. The picture was taken by the imager during testing at JPL.