_iron is _hard metal . fill with articles
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The iron is iron hard metal
Space is also filled with many forms of radiation that are dangerous to astronauts. Much of this infrared and ultraviolet radiation comes from the Sun. High energy X-rays, gamma rays and cosmic rays – particles travelling close to the speed of light – arrive from distant star systems
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I DON'T UNDERSTAND WHAT YOU MEAN, CAN U EXPLAIN ME PLEASE?
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