The top images show coronal cells as viewed from above by STEREO-B (on the left) and SDO (on the right). Their diameters are about 18,000 miles (29,000 kilometers). The bottom images show the same region as viewed almost simultaneously from the sides by STEREO-B (on the left) and SDO (on the right). The bottom views show the plumes as if they were leaning away from each observatory, the way a giant pillar would look if seen from the side. The heads of the black and white arrows mark identical points on the Sun as seen from STEREO-B and SDO, respectively. Credit: NASA/STEREO/SDO/NRL