Resumen de EXPANDING UNIVERSE.
Two letters to the editor in response to the article "The Puzzle of Dark Energy," by Adam G. Riess and Mario Livio in the March 2016 issue, and the authors' reply to these letters are presented.
Two letters to the editor in response to the article "The Puzzle of Dark Energy," by Adam G. Riess and Mario Livio in the March 2016 issue, and the authors' reply to these letters are presented.
