On March 3 1979, Voyager 1 captured this view of Europa transiting over Jupiter's great red spot. The image is composed of a 16-frames mosaic made of 41 individual images (16 oranges filters and 25 violets filters).  It is Io's shadow on Jupiter's clouds, not Europa - this image is made from the same data set than my previous processing of Io. I used Gimp for all the processing.  Europa is slightly smaller than Earth's Moon. Its orbital distance from Jupiter is 670,900 km (414,000 miles) and is tidally locked, so the same side faces Jupiter at all times. Jupiter's Great Red Spot is a vast cyclonic storm system about two times the size of Earth. Since 1979, the GRS have continuously shrinked, slowly changing its shape from an oval to a circle.   This scene is quite meaningful, the size of the BRS - relative to earth, Io's shadow giving a 3d feel, Europa itself, the image looks like a screenshot from a science-fiction movie but it is not, it really happened more than 40 years ago in real life and was captured by…