In this configuration, the two spacecraft are now passing near the two stable Lagrange Points, L4 and L5, of the Earth-Sun system. The STEREO spacecraft are imaging these regions in the hopes of finding material that might have been left over from the original formation of the Solar System.
Revision Note: April 15, 2009:It was pointed out that L4 and L5 were reversed in the initial release of this visualization. These animations and stills were revised to reflect the corrections. 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