I would remove this statement:
> Originally intended to be used as an example of blob detection.

It's easy to forget to update this if the example is changed, and maybe it will be used in many other examples in a few years.
Instead maybe mention some more info
- about the data: color image, shape, dtype?
- about the content: Galaxies of various sizes, shapes and colors ... can be useful as an example for multi-scale detection (this will remain true as the usage in examples changes).