how a fisheye shot/angle makes the moon Io shadow appear ginormous

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https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA23437&fbclid=IwAR19yYszRitq60iX2yw58hlv0X3RwGKFZ5QK2uokXm2780dPt7LNlFVv-CA

I read the article and it still doesn’t make sense to me how the shadow appears this ginormous?

In: Physics
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It makes the shadow big by making Jupiter look smaller. The fisheye lens exaggerates the curvature of the horizon. So, if you were to continue the curve out to form a circle, it would be much smaller than it would look from a narrower angle lens.

It’s only a picture of a small part of Jupiter’s surface, twisted into a circular image. [This](http://www.mikesalway.com.au/wp-content/uploads/2009/05/20090506_1836-mikesalway.jpg) is what a full hemisphere picture of Io’s shadow on Jupiter looks like. Notice the large “white” stripes across the equator and how only one or two of them are shown in the picture you linked.