Planetary Science
The Helios 2 system, which consisted of the Helios 2A and Helios 2B, was a French-developed military Earth observation satellite program. Financed at 90% by France, the development also involved minor participation from Belgium, Spain, Italy and Greece. Helios 2A was launched on 18 December 2004 by an Ariane 5 rocket from French Guiana.
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