随着航天技术的发展,各种航天卫星、航天飞机、宇宙空间站将大量进入太空,人类活动也将从空中扩大到近地空间、远地空间以至整个地月空间。在新的世纪里,太空争夺将日趋激烈,为了满足太空争夺的军事需要,一种与陆、海、空并列的新军种——天军,将成为21世纪的主要作战部队之一。 With the development of space technology, various space satellites, space shuttles and space stations will enter space in large numbers, and human activities will also be expanded from the air to near-earth space, far-away space and the entire earthly space. In the new century, the space war will become increasingly fierce. In order to meet the military needs for space warfare, a new kind of military service, land, sea and air, will become one of the major combat forces in the 21st century.