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Astronomie
Archéoastronomie, astronomie galactique, astronomie extragalactique, astronomie des rayons X, radioastronomie, astrophysique, cosmologie, astrométrie, planétologie, exobiologie, physique stellaire, héliosismologie, astrochimie, astrobiologie…
Exclus : l’astronomie amateur est classée en 3881 « Astronomie ».