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Ruiz was born in Santiago de Chile in 1946. She was the first woman to successfully study astronomy at the University of Chile[1] before she studied at Princeton University and gained her masters in astrophysics.[2]

Ruiz did research at Trieste, Mexico and New York before she gained a Guggenheim fellowship. She discovered Kelu 1, a Brown Dwarf.[1]

As of May 2016, she is a member of the Chilean Academy of Science and a professor at the University of Chile,[3] where she teaches astronomy. She is also a member of the Centro de Astrofísica CATA (CATA Centre for Astrophysics).[4]