Document Type : Research Paper

Author

• Seyyed Yahya Safavi

Assistant Professor, Imam Hosein University

Abstract

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.