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The Royal Belgian Institute for Space Aeronomy (BIRA-IASB) (Dutch: Koninklijk Belgisch Instituut voor Ruimte-Aeronomie - BIRA, French: Institut royal d'Aéronomie Spatiale de Belgique - IASB) is a Belgian federal scientific research institute. Created in 1964, its main tasks are research and public service in space aeronomy, which is the physics and chemistry of the atmosphere of the Earth and other planets, and of outer space.

The Planetarium of the Royal Observatory of Belgium is a Belgian planetarium and part of the institutions of the Belgian Federal Science Policy Office.The dome of the planetarium measures 23 metres in diameter, on which the Sun, the Moon, the planets, the Milky Way and more than 8500 stars can be projected.