Top 8 panels: the August 31, 2007, prominence eruption as seen by the EUVI instrument (HeII 304 filter) by the two STEREO-B (left) and STEREO-A (right) spacecraft at four different times. The color scale has been changed to better show the off-limb erupting plasma. Bottom 8 panels: the CME of August 31, 2007, as seen by the COR1 telescopes onboard STEREO-B (left) and STEREO-A (right) at four different times. The prominence observed at earlier times by EUVI (top) is associated in the COR1 images (bottom) to the “loop-like” feature visible in the expanding CME core.