A diverse cast of rocky worlds around a small star revealed by Montreal astronomers UdeMNouvelles07/22/2025 Illustration of the planetary system of L 98-59. In the foreground is the habitable-zone super-Earth L 98-59 f, whose existence was conùfirmed in this study. Volcanic planets, a sub-Earth, and a water world Charles Cadieux, the IREx researcher who led the study on the L 98-59 system. “These new results paint the most complete picture we’ve ever had of the fascinating L 98-59 system,” said Cadieux. The innermost planet, L 98-59 b, is only 84% of Earth’s size and about half its mass, making it one of the rare sub-Earths known with well-measured parameters.