نوع مقاله : مقاله پژوهشی
نویسنده
استادیار دانشگاه امام حسین(ع)
چکیده
عنوان مقاله [English]
نویسنده [English]
The space that lies beyond the blue sky is completely dark, because light can not travel as fast as usual through diluted air or vacuum. There is total silence in the space, and however the spaceship moves fast, no sound is produced by it in the space. Sound echo, shock waves and speaking have no effect in space.
Geographic factors take different meanings in space. Thus, any space activities require familiarity with necessary concepts for maneuvering in modelling environment.
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