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Oh no! Turns out my Mollweide projection was flipped relative to Gaia's. Find the sky-right version here: (and thanks to the hawk-eyed @ohdearz, @_sublunar_ and @astroprofhoff for catching it!)
A sky map of all supernovae discovered since the 1800's. The Vera Rubin Observatory will find ~300,000 in its first year alone!