I suspect greesil means resolved beyond a point source. We've so far only managed that for stars: https://en.wikipedia.org/wiki/List_of_stars_with_resolved_imag

I suspect greesil means resolved beyond a point source. We've so far only managed that for stars: https://en.wikipedia.org/wiki/List_of_stars_with_resolved_images https://en.wikipedia.org/wiki/List_of_stars_with_resolved_im... .