Category:1931 in astronomy
Science: Astronomy · Biology · Geography · Geology · Mathematics · Medicine · Paleontology · Physics ·
Deutsch: 1931 in der Astronomie
English: 1931 in astronomy
Македонски: Астрономијата во 1931 година
Русский: 1931 год в астрономии
Svenska: Astronomiåret 1931
Subcategories
This category has the following 3 subcategories, out of 3 total.