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Features in the April 2013 issue are:
* The Curiosity rover proofs that Mars was once hospitable to life.
* An interview with Green Bank astronomer Jay Lockman.
* Launch of the SpaceX CRS-2 mission to the ISS.
* A conversation with Skylab astronaut Ed Gibson.
* Story behind the effort to repair Skylab.
* Ride along with the members of the 920th Rescue Wing as they clear the danger zone.
* Visit the California Science Museum and stand alongside Endeavour. 更多
