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    • An ancient extrasolar system with five sub-earth-size planets 

      Ragozzine, Darin A.; Campante, Tiago L.; Barclay, Thomas S.; Swift, Jonathan J.; Huber, Daniel; Adibekyan, V. Zh; Cochran, William D.; Burke, Christopher J.; Isaacson, Howard T.; Quintana, Elisa V. (2015-01-27)
      The chemical composition of stars hosting small exoplanets (with radii less than four Earth radii) appears to be more diverse than that of gas-giant hosts, which tend to be metal-rich. This implies that small, including ...