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Castor and Pollux (French satellites)
A pair of French microsatellites, also known as D5A and D5B, launched unsuccessfully on May 21, 1973, by a Diamant B from Kourou. Castor was to have studied interstellar space and collected aeronomy and geodesic data; Pollux was to have tested a hydrazine propulsion system.
Related category
• SATELLITES AND SPACE PROBES
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