What can astronauts do to protect themselves from radiation in space?

         Protecting astronauts from cosmic radiation during long space missions-a trip to Mars for example-would require a shield of matter with a density of around 1 kg/sq cm, which would involve something like a 10-m-thin layer of water. The enormous weight of such a shield would vastly increase the costs of a mission to Mars, which is why space travel experts are searching for alternatives. It may be possible to produce an extremely strong magnetic field to act as a shield, but the strengths required would call for the installation of superconducting electromagnets aboard spacecraft.

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