The 50th Paris air show will offer French space agency CNES an opportunity to detail engineering tradeoffs being weighed as it designs a leaner, more cost-effective successor to Europe's Ariane 5 heavy-lift rocket. The new launcher is expected to fly in 2020, assuming European Space Agency (ESA) governments approve the estimated €4 billion ($5.2 billion) project at a meeting of ESA ministers slated for 2014. Known as Ariane 6, the rocket is being designed to carry satellites of ...

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