Controllers at the Jet Propulsion Laboratory were continuing to diagnose a problem with the xenon ion engine on NASA's Deep Space 1 probe yesterday, after recovering the spacecraft from a self-induced safe mode. Plans called for transmitting an engine-start signal to the spacecraft late yesterday, in the expectation that it would generate a new flow of data that engineers could use to analyze why the xenon-fueled electric propulsion system shut itself down after operating only four ...

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