This certificate verifies that Víctor Maestre Ramírez successfully completed and passed the online course ASTR105x: Alien Worlds: The Science of Exoplanet Discovery and Characterization offered through BUx, Boston University's online learning initiative on edX. The certificate was issued on January 9th, 2015 by Assistant Professor Andrew A. West in the Department of Astronomy at Boston University and can be verified online at the provided URL.