Multimedia Gallery
April 30, 2007
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The illustration depicts the trajectory of radar speckles tied to the rotation of Mercury.
The illustration depicts the trajectory (green circles, 1 second timestep) of radar speckles tied to the rotation of Mercury. Observers measured how long it takes for the pattern to travel between two antennas (red triangles) to measure the rotation rate of Mercury.
Credit: Jean-Luc Margot, Cornell University
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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Related story: Mercury's Soft Center