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They say it's a picture of atoms, but what are the atoms: the glowing yellow balls or the entire meatball including the darker red? If it's the meatballs, then why do some have apparently two nuclei?
Here's the public press release: https://news.cornell.edu/stories/2021/05/cornell-researchers-see-atoms-record-resolution
Here's the actual scientific article: https://www.science.org/doi/10.1126/science.abg2533
The yellow areas are the 'shades' of the nuclei, but do not reflect their actual size. The lattice constant of the crystal according to the figure is 59 pm = 59 e-12 m, which is the horizontal or vertical distance you see between two of the Pr couples. The actual size of a nucleus would be of order ~ 10 fm = ~ 10 e-15 m.