On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery . On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery . On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery . On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery . On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery . On Tuesday, astronomers of the Carnegie Institution for Science in Washington, DC, United States, announced the discovery .