The illustration in the article ([1]) seems to be a (slightly cropped) Mollweide projection [2], in familiar equatorial coordinates such that the north pole is

The illustration in the article ([1]) seems to be a (slightly cropped) Mollweide projection [2], in familiar equatorial coordinates such that the north pole is top center, south pole is bottom center, and the equator is a (imaginary) horizontal line in the middle. The region of acquired dark matter data is located in the southern hemisphere sky, which makes sense given that the observatories used were in Chile. At the bottom you can see the Magellanic Clouds, satellite galaxies of the Milky Way which can only ever be seen from the southern hemisphere. [1] https://ichef.bbci.co.uk/news/976/cpsprodpb/F39E/production/_118666326_widepic.jpg https://ichef.bbci.co.uk/news/976/cpsprodpb/F39E/production/... [2] https://en.wikipedia.org/wiki/Mollweide_projection https://en.wikipedia.org/wiki/Mollweide_projection