The first time I scanned a planet in ED I was a little disappointed due to the lack of any visual clues of the actual scanning process. I was expecting something like the "wire frame" overlay one can see when scanning planets in the Mass Effect games.
By slowly letting such a wire frame grow of the whole planet from top to bottom - from your current perspective, that is - it could also be a nice indicator of how much time the scan will need to complete.
It doesn't need to be very fancy, just something like this would already add some nice exploration vibe to it, IMHO:
View attachment 17848
And for the sake of completeness, here is the respective visual from ME:

By slowly letting such a wire frame grow of the whole planet from top to bottom - from your current perspective, that is - it could also be a nice indicator of how much time the scan will need to complete.
It doesn't need to be very fancy, just something like this would already add some nice exploration vibe to it, IMHO:
View attachment 17848
And for the sake of completeness, here is the respective visual from ME:
