NASA's Project Prometheus, which is developing nuclear power sources for deep-space exploration vehicles, plans to examine whether it would be possible to use electricity from a space reactor to shield crews from natural radiation. "That's something that we're going to look at, to see if there's a way that we could use excess electricity to generate some kind of electromagnetic field," said astronaut Carl Walz, who experienced radiation-induced flashes of light inside his closed eyes while ...

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