Oh , Ralph , I heard it is very dangerous traveling in space . Disasters have happened before . If the spaceship were out of order . . .
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user
You should be optimistic about this . Things have taken a good turn . You should remember that less than two centuries ago the dangers of train travel seemed similarly terrible .
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assistant
But is it possible that travelers could be hit by meteors ?
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user
It's once in blue moon .
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assistant
What do you think is the real danger man faced in space ?
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user
The main one is radiation . There are two sorts of radiation man must fear in space . The first is radiation from the sun , and this is particularly dangerous when the sun is very active and explosions are occurring on its surface . The second , less harmful , comes from the so-called Van Allen Belts .
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assistant