PARIS — Satellite and rocket manufacturer Orbital Sciences Corp. expects by the end of April to have a firm grasp of what caused the March 4 failure of its Taurus XL rocket’s fairing to separate, resulting in the loss of a $424 million NASA climate-observation satellite in the second consecutive fairing-related failure of the rocket in two years, Orbital officials said April 21.

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Peter B. de Selding was the Paris Bureau Chief for SpaceNews.