Only two years later, he graduated in astronomy and atomic physics, and during the following two years, he completed a doctoral degree, which was evaluated with the best marks in December 1929, when he was 21 years old.
Blot to år senere fik han en grad i astronomi og atomfysik, og i løbet af de næste to år afsluttede han en doktorgrad, som blev antaget i december 1929, da han var 21 år.