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One of them are cosmic rays come from outside the heliosphere and make their way,

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and they are very energetic and they are hazardous for astronauts. If you are

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sitting on Earth, we have the Earth's magnetic fields to shield us from

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energetic particles and they are deflected around. As soon as we leave

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Earth, send astronauts to moon, to Mars, to beyond, they are not protected. We have

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to have an idea how large and how intense those cosmic rays are going to

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be and when and how they are going affect astronauts for example.