Observatoire de Paris-Meudon - In preparation

Observatory of Geneva - In preparation

OCCHIALINI, Giuseppe (1907 - 1993) - In preparation

ODISSEA (Campaigns)

OERLEMAN, Fons - In preparation

Office of Naval Research (ONR) - In preparation

OLIVERO, Eduardo A. (1896 - 1969) - In preparation

OMEGA (System) - In preparation

On a Wind and a Prayer (Documentary) - In preparation

On the threshold of Space (Movie) - In preparation

Operation Churchy - In preparation

Operation Outward

Osoaviakhim-1 - In preparation