Thought this might be of interest to denizens...
https://www.bbc.co.uk/news/science-environment-52264743QUOTE:
One of the techniques used by Mr Saunders is known as "stacking", in
which many frames are assembled on top of each other to improve the
image's detail.
QUOTE
Among other things, Mr Saunders had to correct the "fish eye" effect created by the camera's wide angle lensQUOTE
But because he was dealing with moving pictures, Mr Saunders had to
re-align multiple parts of the image, combining all the results into one
final picture.