Spaceship passes critical review

The spacecraft Nasa is developing to replace the shuttle has passed a critical milestone. The Orion capsule, which is intended to carry at least four astronauts into Earth orbit and beyond, has completed its preliminary design review, or PDR. The review is an essential engineering assessment that certifies the concept is fit for purpose. The completion of the PDR paves the way for the US space agency to start to build the capsule for flight. This is the successful culmination of all of the design trade studies and activities to date, said Mark Geyer, manager of the Orion Project Office at Nasa's Johnson Space Center in Houston. As a project, a programme and an agency, we are reviewing the design maturity, strategy and plans for Nasa's next human spacecraft and agreeing that this is the architecture we are going to build.

The US space agency is scheduled to retire its space shuttles next year, and has begun the development of a new human space launch architecture called Constellation. The architecture calls for two new rockets: the Ares 1 to launch crew, and a new heavy-lift rocket known as Ares 5 that could put into orbit the equipment needed by an Orion capsule to travel to the Moon and beyond. However, all the systems are under review by a top-level panel led by former Lockheed Martin chairman and chief executive Norm Augustine. President Barack Obama has asked the panel to assess different options for getting US astronauts into space.

Some commentators expect the Ares development plans to be modified or even cancelled. Orion is scheduled to enter service no earlier than March 2015.

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