Comparison of the N-closest and N-convex algorithms using an 8-colour irregular palette with . Left to right: N-closest, N-convex.
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Josh Dury, from Bristol, photographed the phenomenon from a radar memorial in Worth Matravers, Dorset, on Tuesday just after 18:30 GMT.
Nature, Published online: 25 February 2026; doi:10.1038/d41586-025-04161-7