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Ibn Rushd, Abu’l Waleed Muhammad Ibn Ahmad Ibn Muhammad
Ibn Sina, Abu Ali
Ibrahim, ibn Sinan ibn Thabit ibn Qurra
Index Catalog (IC)
Indus (constellation)
Infrared Arrays
Infrared Astronomical Satellite
Infrared Imagers
Infrared Space Missions
Ingalls, Albert
Innermost stable circular orbit
Institut de radioastronomie millimétrique
Institut National des Sciences de l'Univers
Institute of Space and Astronautical Science
Instituto Argentino de Radioastronomía
Instituto de Astrofísica de Canarias
