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A personification of the M87 Black Hole, the first black hole to be ever photographed.
Her appearance varies, but the most popular (and first) depiction originated from Danbooru post #3473464, drawn by survival yaiba. In this depiction she is nude, with glowing orange irises with black sclera to match the picture of the black hole, and long two-toned hair that's black on the outside and glowing orange on the inside. Sometimes she is also given dark skin.
Another depiction originated in Danbooru post #3474352 by dishwasher1910. In this version she has normal eyes, an ahoge and crossed bangs, and wears a china dress.