Today's (Sunday, 2012 July 22) APOD image has appeared on APOD before and was indeed quite widely circulated in the 1990s. We are curious, however, how many newer viewers of APOD are unfamiliar with some of astronomy's classic older images. APOD reruns images on Sundays partly to bring back to light famous astronomical images for those who have never seen them. Therefore, by answering this poll question honestly, you are helping APOD's editors better know what fraction of APOD's current audience might have or have not seen a historically famous astronomy image. Note, though, that this image is particularly
famous, and we would therefore expect perhaps a comparatively high fraction of our viewers to have seen this image previously.
The image is again posted here for clarity: