This dimension marks whether a launch vehicle is still active, retired or still in development. Wikipedia notes that launch vehicles are "engineered with advanced aerodynamics and technologies, which contribute to high operating costs," costs that eventually lead most vehicle types to retirement in favor of a successor. Browsing by status separates vehicles still flying from those no longer in service.
Facts
Comparison
Field Origin Era Sources
1. Wikipedia: Ariane 1
Wikimedia FoundationAriane 1, Launches sectionQuote, Ariane 1, Launches section
On 24 December 1979, the first Ariane launch, designated as L-O1, was conducted, which was successful.
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